Watch Education

Accuracy movement (7 to 30 seconds/month)

The accuracy movement of watches primarily depends on the operating principle (quartz or mechanical (see "Watch type"), and the accuracy of mechanism adjustment and the number of jewels in mechanical models.

All quartz watches thanks to better technology show more accurate time: watch error is only 15-20 seconds per month. Mechanical watches, no matter how expensive they are, still require periodic adjustments (usually at each winding). Watch error is 10-20 seconds per day.

Alarm clock

The presence of the alarm function in a wristwatch. The alarm function is implemented via signaling module built in a watch mechanism. It beeps in a user-specified time. In today's watches there may be several alarm settings (see "The number of alarm settings").


The presence of altimeter functions in the wristwatch. Altimeter is a device that allows you to determine the altitude of the device (and, consequently, of its owner) above sea level. The principle of altimeter operation is based on measurement of atmospheric pressure: the less the pressure, the higher the device is above ground level. The obtained data are displayed as numbers. In wristwatches the data are most often indicated in meters.

Another time zone.

Function of simultaneous displaying the time of two time zones (watches with GMT). First of all, this function will be appreciated by the people who frequently cross the boundaries of different countries (businessmen and travelers). The idea to divide the planet into several time zones has started up with the advent of high-speed transport capable of passing over enormous distances. Since people got an opportunity to move quickly from one country to another, it became important to know time in each of them. To adjust the cities the rotating ring on the face or the head are used, and to determine the time there is an additional hand (usually at the bottom of the face).

Case diameter (from 8 to 90.0 mm)

Case diameter of wristwatches. Functionality and quality of watches are in no way related to height or width of the case. The height and width are equally dependent on the design and size of digits on the watch dial. Depending on personal preferences or fashion trends, you can choose the watch having case diameter of different sizes (from 0.8 to 9 cm). Despite of fashion dictate, it is necessary to take into account some general recommendations. In the classic version the case should look harmonious on the wrist and not to exceed its size.

Case material

The material the wristwatches made of. This item is an important parameter when selecting the model because it significantly affects the watches cost. The watch case may be made of stainless steel, aluminum, plastic, brass, a zinc-aluminum alloy, titanium, platinum, silver, gold, palladium, or ceramics. The most popular material, of course, is stainless steel, and rather an alloy with the addition of chromium and nickel. Steel is strong, durable, hypoallergenic and inexpensive to manufacture. It has only a slight disadvantage: with time the scratches will inevitably appear on the case that worsens visual appearance of the watches. However, it is possible to carry out polishing of the surface, and the clock will again be like new. Stainless steel is considered to be an example of an optimal quality-price ratio. Sometimes aluminum watches are offered on the market. Aluminum is very light and cheap metal. But it is not very durable and can be easily scratched. Plastic is known to be inexpensive and quite practical material. But in the case of plastic watches this material is not an indication of cheap models. For example, particularly hard plastics are used in expensive watches.

Zinc-aluminum alloy is the cheapest material used in the production of watch cases. This alloy is soft, can be easily scratched and quickly wears out; therefore it requires additional protective coating.

The cases made of brass (an alloy of copper and zinc) are durable enough, but less durable than the cases made of stainless steel. Moreover, brass is oxidized in air and the metal corrodes by interaction with the human skin. In this regard, brass cases often have an additional coating. Nickel coating, widely used in manufacture, can cause allergies, if a person has such a predisposition. However, brass watches are still in demand due to the low price.

Titanium like stainless steel has high strength and does not require an additional coating. It is lighter than steel and has a beautiful matte shade. But after polishing, titanium does not practically differ from stainless steel.

It’s not so long ago that ceramics began to be used in the production of watch cases. Special alloy is distinguished by high strength and is wear-free. However, ceramics watches cannot impress anyone by their light weight. Watches with silver case can be a good gift for the anniversary. However, they are not very practical: silver is a soft metal, is rapidly oxidized, and therefore requires special care. These watches are not light.

Palladium resembles platinum in appearance, but it is much lighter in weight. It is a very beautiful metal resistant to corrosion; it is not oxidized and takes a good polish. Palladium is widely used in the manufacture of jewelry; in particular, it is added to gold, which eliminates yellow color of the latter. Colloquially, this alloy is better known as "white gold".

Gold case of the watch is considered to be prestigious, expensive and beautiful. Gold is one of the most popular precious metals, so even despite its softness, it is still very popular.

The most expensive and rare metal that is used in the manufacture of watches is platinum. It is a very beautiful gray metal which is more durable than gold, but it is quite heavy. Mostly exclusive, handmade or made-to-order watches are produced from gold.


Chronograph is a very useful complication. It is a stopwatch, i.e., a timer that can be started and stopped to time an event. There are many variations on the chronograph. Some operate with a center seconds hand which keeps time on the watch's main dial. Others use sub-dials to elapsed hours, minutes and seconds. Still others show elapsed time on a digital display on the watch face. When a chronograph is used in conjunction with specialized scales on the watch face, it can perform many different functions, such as determining speed or distance. Some chronographs can time more than one event at a time.


This term refers to a precision watch that is tested in various temperatures and positions, thus meeting the accuracy standards set by an official institute in Switzerland. Most watch companies provide a certificate with your chronometer purchase. Initially, chronometer was used on the ships to determine their location using the time difference. Such a "compass" demanded maximum precision and stability, so to refine and improve the mechanism one should make a lot of effort. The uniqueness of chronometers is that it has to keep the accuracy movement regardless of changing the case position. Due to the fact that our hands are almost always in motion, ordinary wristwatch has a noticeable time error. A chronometer watch must not lose more than four, nor gain more than six, seconds per day (see "Accuracy"). Roughly one million watches are certified as chronometers each year, making up 3% of total Swiss watch production. Such a watch is typically made of high quality parts and materials. For the watch to be called a chronometer, it must be specially certified.


The presence of compass function. Compass a device for terrain orientation. The presence of a compass in the watch will be especially important for people who are fond of hiking or extreme sports. Wristwatches are often equipped with a classic magnetic compass.

Countdown timer

The presence the function of timer in the wristwatch. Timer is an instrument used for registering intervals of time (durations, brief times), without any indication of the time of day. To complete different operations a certain amount of time is required, which sometimes needs great precision. Countdown timer determines the remaining time set by the user (similar to an hourglass), after which the alarm signal sounds.


The Crystal is a 'glass' covering the dial or 'face' of the watch, protecting it from dirt and water. There are three major types of crystals produced and used in watch making.

Cristal in watches performs, in fact, the only and very important role of protecting the dial from mechanical damage. Therefore, in watch making several types of glasses are used that meet the structural strength requirements: mineral, sapphire, plastic or combined – mineral-sapphire.

Plastic glass is the cheapest version. It has one obvious advantage over mineral crystal: it is impossible to break it. However, it can be easily scratched. Plastic is used in inexpensive watches and sports models with plastic case.

Mineral glass is the most delicate - it is almost as easy to scratch as plastic. Mineral crystal is rather easy to break. To make the glass stronger, it is tempered and additional protective coating is applied. Mineral glass refers to the average price category.

The most durable and expensive is the sapphire crystal. It is the most resistant to scratches, and this helps the watch to keep presentable appearance. However, it is quite brittle - it is the easiest to break.

Combined glass unites the advantages of mineral and sapphire glass, due to this it has acquired both durability and scratch resistance. At the same time, it is cheaper than sapphire. Most of the crystals in modern wristwatches have an additional antiglare coating.

Depth gauge

The presence of depth gauge function. Depth gauge is a device that allows determining the depth of the dive. All watches equipped with a depth gauge are to have a waterproof case (see "Waterproof").Under pressure a special built-in sensor is deformed. The detector reads and transmits the data to the display. Digital depth gauges provide indications of current and maximum diving depth. The built-in depth gauge is great for scuba divers, since there is no need to take a separate device.

Display illumination

Availability of display illumination in electronic wristwatch (see "Time Mode"). This feature makes it easy to view the display time in the dark. Today, in many wristwatches luminous illumination is used, which is also known as "cold light". The energy source is an electron which emits the energy as light at ordinary temperature. This means that the watch face is energized during a sunny day and begins to emit in the dark. Less complicated watches use illumination powered by batteries, in this case it is activated by pressing a button. In addition to the display illumination, there is another way to display the time in the dark – illumination of watches hands and hour marks with luminous paint (see "Hands illumination").

Displaying months

Availability to display the current month on the face. Month can be displayed as an ordinal number or acronym.

Displaying the date

Availability of displaying the current date on the watch face. The date is usually displayed on the electronic models or in the window of traditional watches with hands (see "Time Mode").

Displaying the day of the week

Availability of displaying of the current day of the week on the face. Day of the week is usually displayed on the electronic models or in the window of traditional watches with hands (see "Time Mode") as an abbreviation.

Displaying the year

Function to show the current year on the watch face. This function is available only if there is a perpetual calendar (see "Perpetual Calendar").

Energy source

Energy source of wristwatches. The source can be electric or solar cell battery, spring mechanism, power from arm heat or «Kinetic» (energy derived from the arm movement). In mechanical watches the energy source is always a spring mechanism, which thanks to its pressure actuates the clockwork. When the spring slackens the wind is over, the watch stops. On average, a winding lasts for 36-48 hours. In mechanical watches the spring can be rewound manually by turning the watch crown or with the help of the self-winding mechanism (see "Self-winding").

Quartz watches traditionally use conventional battery with the capacity resource sufficient for several years of operation.

More economical energy source is solar battery. In this case, the watch has a special translucent dial. Light hits the sensory photocell which converts the sun's rays into energy accumulated in the capacitor and powers the quartz movement. However, this alternative power source is not always suited to all users. Thus, the solar cell is ineffective in the cold season, when you have to wear long-sleeved clothing that hides the watch from already scant rays of the sun.

The most promising and interesting power sources appear to be energy from the motions or heat of the wearer’s arm. For the watch to operate by the heat of arm thermoelectric generator is built into it. To date, this technology is still under development. Scientists still can not get enough energy to provide power, for example, for mobile phones or laptops. Wristwatches are less energy-demanding, so it is in their production, the power system involved can be implemented right now.

Kinetic system is based on the action of kinetic energy, i.e. the energy of motion, in the case of the watch - that of hand movement. This system has been applied in the manufacture of watches for more than 15 years. The first models had a rather large mechanism, but it was constantly improved. Due to this, the models using the system Kinetic, performed in a thin case and supplemented with complicated software are on the market today.

Gemstones insert

Presence of inserted gemstones on watches face. Gemstones are used as decorations. Depending on the ideas of the designer one or several stones may be located.

The stone can be both precious and semiprecious one (see "Inserts Type"). The number and quality of the stones substantially affect the value of watches.

Hands illumination

Availability of hands illumination in analog wristwatches (see "Time Mode"). This feature makes reading the time easier on the dial in bad light conditions. Today, in many wristwatches luminescent method of illumination is used, which is also known as "cold light". For this purpose a special paint that glows in the dark is employed. That is, the coating is charged with energy during daylight hours and begins to emit it in the dark. In analog watches only fluorescent illumination method is used for hands illuminating. In some models, along with hands numerals and hour marks are also illuminated.

Insertion Type

Type of inserts on wristwatches housing (see "Inset stones").

Different stones (both precious and semi-precious) can be used for case decoration: diamond, sapphire, opal, topaz, onyx, garnet, agate, amethyst, zircon, turquoise, cubic zirconium and pearl, crystal and Swarovski crystal.

Swarovski is a well-known brand, engaged in creation of crystals from rock crystal skillfully imitating diamonds. Swarovski crystals are commonly used as decorations in jewelry, clothing, furnishings, etc. Rhinestones are considered to be fashionable and glamorous decoration.

Internal Memory

Availability of internal memory in watches. Usually it has a small content and is used in models with additional functionality, for example, GPS function, notebook, etc. Synchronization with the PC, in most cases is provided by USB port.

Material of Bracelet / Strap

The material bracelet or strap watches made of. Bracelet as a watch accessory has been applied much later than compact watches appeared. Quite a long time people used to wear them on a chain in the pocket of the coat, and did not want to wear them on the wrist. But over time, they, however, recognized that wearing a watch on the wrist is much more convenient and practical.

The material the watch made, bracelet color, width and pattern affects presentable look of the watch.

The bracelet can be made of different materials such as leather, plastic, stainless steel, textiles, ceramics, precious metals and titanium.

Leather watch strap is made of soft leather. Straps for expensive watches are subjected to various thermal and other tests. Typically, leather straps are made up of three layers: external, internal and extra soft interlayer between them. The idea is that high-quality straps must withstand temperature extremes, be water resistant and not deteriorate when exposed to sunlight. The price of strap is also affected by the leather it is made of. For example, cheap items are mainly made of hog-leather or calf-skin while offers for exclusive models straps may include crocodile, antelope leather, and so on.

The straps made of plastic and silicone are usually attached to the cheaper models or children's watches (see "Type"). Flexible plastic is rather practical, easy to use, and water resistant. However, these straps are short-lived; with time the cracks will surely appear on their surface. But thanks to the low price you will have no difficulty to replace them.

If you try not to use leather or plastic, as an alternative, you can buy a watch with textile strap. The advantages of this material are obvious: it is inexpensive, and because of the simple manufacturing techniques you can find in the sale textile straps of very different colors. However, under the influence of water the fabric can deform.

At about the same place in popularity with leather straps are metal bracelets. They can be of so interesting design that sometimes the main accessory in a pair "Watch - Bracelet" is considered to be the second one. Bracelet made of metal is, of course, very durable and water resistant. Bracelets are always of stylish look and give the watch solidity and value. However, its durability is easily questioned: a great number of fasteners will inevitably make it more fragile. Unlike leather straps, bracelets are heavier; moreover, many people suffer from metal allergy.

Depending on your preferences, you can choose a bracelet of several types: elastic bracelet (metallic elements are interconnected with springs, whereby the strap can be easily adjusted for size), skeleton bracelet (usually used in women's watches, has a rigid base without fasteners) and the classic version – non-stretch bracelet with a clasp. All bracelets, regardless of the material which they are made of, are usually treated as fashion accessories, decoration. They are chosen individually to match the watch.

Moon phase

There is a sub-dial displaying the phase of the moon. It is a traditional and aesthetically pleasing feature, the Moon phase complication shows if it is a full, half, quarter, or new moon. Originally, it was primarily used by sailors to gauge tides.

The sub-dial has rotating display window with the image of the moon. Full rotation of the moon is made up to 29 days, to designate each day certain gradation is provided, due to which every phase of the moon is registered.


The availability of a notebook in digital watches (see "Time Mode"). This function allows the user to create different notes. Number and volume of records is limited to the built-in memory of the electronic unit.


Type of numerals on the dial of analog watches. There are several variations: Arab and / or Roman numerals, as well as the absence of any numerals on the dial, for example, Twelv-watches (see "Time Mode"). Arabic numerals are numbers on a watch dial that are written the way we typically write numbers.

Arabic numerals originated in India more than 15 centuries ago. Over time, they underwent modifications and eventually received their modern form, which is used by most of the people on our planet. Arabic numerals came to Europe in the 12th century and retained their name only historically because decimal number system is used. In the modern Arab countries numerals have slightly different writing. It is believed that the watches with Arabic numerals are preferred by young, energetic and motivated people.

History of Roman numerals goes back more than one millennium and originates from the Etruscans. These numerals were widely used by the ancient Romans. The principle of writing natural numbers consists in combining Roman letters. Usually, more conservative, pragmatic and very together persons prefer watches with Roman numerals.

Actually, the color display system for time indication can be provided not only on watches, but also on any object around us, such as electronics and home appliances.

The number of digits on the dial may be different - from 0 to 12. The classical representation is 12 digits indicating each hour. In order not to overload the dial, sometimes only 4 digits marking certain time intervals (12, 3, 6 and 9 o'clock) are used. We can often find watches having all 12 time divisions on the dial (sometimes even without them), but with the complete absence of numerals.

Perpetual Calendar

The availability of "perpetual" calendar function in the watch. The so-called "perpetual" calendar displays the date, day of the week, month and year (there are various options depending on the model) in the window of the watch face. This is a rather complex mechanism that can count the number of days in each month, including leap year. Therefore, the calendar in respectable models can really be designed for centuries. There is yearly calendar in simple models: it may require adjustment quadrennially (in February of each leap year) or once a year.


The wristwatch has an intended function of taking a pulse. The pulsemeter is a device allows you to measure the pulse (heart rate). Upon contact of the watch case with an arm a sensor reads the heart rate and reproduces the mean value on the display. The presence of heart rate monitor allows people involved in sport to control their physical activity and general state of health.

Second hand

The location of the second hand on the dial. Traditionally, mechanical watches have a dial and the hour, minute and second hands located in the center. The watches with chronograph (see "Chronograph") for measuring time intervals often use a center seconds hand, while usual second hand, showing the current time, on the contrary, is situated on a subdial, i.e. it is displaced. Some models have two central hands, each performing its role. Some watchmakers displace the hand just for appearance. Some watches (not necessarily with chronograph) have no second hand at all


The presence of a self-winding in wristwatches. It is mainly used in mechanical watches, so the latter are uncomfortable by the fact that you need to wind up spring mechanism very often. Therefore, as early as the XIX century, the famous French watchmaker and inventor Abraham Breguet invented the self-winding watch. There was a swinging weight inside the watch the movements of which allowed to set a spring from which the watch operates. But this happens only at natural motions of the wearer’s body, i.e. its operating principle of action is similar to that of a conventional pedometer. For example, if your active day makes up at least 8 hours a day, no mechanical winding is needed at all. Power reserve with fully automatic winding is 36 hours. Today, self-winding function is very seldom to be found with the manufacturers of quartz watches: hybrid quartz models in which a permanent accumulator is used instead of the usual battery.

This function has one drawback: the mechanism is quite bulky, which significantly affects the appearance of watches. Therefore, for ladies’ watches not to lose their elegance they are rarely equipped with self-winding mechanism.


Shape of the watch’s dial. It can be made in different shapes: round, square, rhombic, rectangular, barrel-shaped, trapezoidal, oval, heart-shaped, asymmetric or irregular. When choosing the form of the watch only individual preferences of the future owner really matter.

Shock resistant

The presence of a shockproof device in wristwatches. It is a watch’s ability to withstand an impact equal to that of being dropped onto wood floor from a height of 3 feet.

This device consists of movable delicate pivots that hold the balance wheel. During the strike the watch the balance axis shifts toward and rests on a special limiter. Thus, all the fragile parts of the watch are not subjected to a strong impact and do not damage.

Skeleton Watches

Skeleton Watches have a case with a transparent front or back that allows the wearer to view the watch's movement. As a rule, in such a watch the mechanism is fully visible to the eye.

The process of creating the skeleton requires the same high precision as in making of the clockwork itself. These watches are always a work of art, where appearance of each part is tight-knit. This results in the appearance of elegant openwork case. Some watchmakers make transparent only the dial, while others make only a small window with an open balance.


The presence of a stopwatch functions in a wristwatch. Stopwatch is device that allows you to measure time to within a second or even a fraction of a second. The stopwatch can be started and stopped at random. It is mainly used in the sport stopwatch to accurately measure the intervals of time. But it is often used in other areas of daily life.


Availability of tachymeter scale on the watch bezel. The Tachymeter feature can be used to measure the speed at which the wearer moves, over a given distance. Typically placed on the bezel and generally only found with chronographs, the tachymeter measures units per hour. For reading tachymeter indications second hand is used. There are numerals on the bezel showing the speed. When you start the tachymeter the hand begins moving in a circle. After it stops, you can see the number in front of which the hand stopped. This is the indication of the speed.

The thickness (3.0 to 25.0 mm)

Thickness of watches case. As a rule, the case of women's watches is more elegant and thinner than that of men's watches.

Primarily, the thickness depends on the functional type and, respectively, on the functional complications. The overall size of the watch is also dependent on the degree of water resistance. The higher the level of waterproofness, the more massive the case is.

The thickness of the watch must be in harmony with the clothes and the image of its owner. To match the suit it is recommended to choose an elegant watch with a flat case, while the massive multi-functional watch looks good in combination with informal or sports clothes.

The time displaying

The time information can be displayed on the dial in analog form, with a numbered dial upon which are mounted at least a rotating hour hand and a longer, rotating minute hand. Many watches also incorporate a third hand that shows the current second of the current minute. On the electronic display a digital way of showing the time is used. There exists the combined method using double time display (analogue and digital). Besides, there is another option - Twelv (see below).

Mechanical watches can have only one way to display time that of analogue one.

Quartz watches are more advanced from a technological point of view. They can provide many additional features, including showing the time on the display. In ordinary models with a simple mechanism there is more frequently time display with hands. In a more functional model the makers prefer to use an electronic display method. This way is convenient in that a lot of useful information can be reproduced on the watch. It is impossible to do the same in case of analog models. In recent years, combined watches are gaining in popularity. These have both hands and digital display (one or even a few) on the dial. In this case, usually the time is indicated by the hands and duplicated on the display. But if necessary, any other necessary data are displayed. Thus, producers manage to maintain the classic analog form and to equip the watch with a variety of additional functions.

The width

The width of wristwatches case (0.0 to 70.0 mm).


The presence of the instrument for environment temperature measurement. This function allows you to always be aware of weather conditions in the area. This is especially topical for those who travel a lot and leads an active lifestyle. There are watches with the function of measuring free-air or water temperature.

Time Format

Time display format on the digital display (see "Time Mode")can be a 12-hour, 24-hour and universal (12/24-hour).12-hour watch involves dividing the day, i.e. 24 hours, into two intervals of 12 hours: AM - "before noon", and PM - "after noon". 12-hour format is commonly used in colloquial speech ("three o'clock", "two o'clock"), so to facilitate the understanding of time this format is also used in watches. Officially, it is used in many countries: England, USA, Greece and so on.

However, the most common format for time display in European countries is j a 24-hour format. The day is divided evenly into 24 hours; reference time is at midnight. But in the electronic watch the time is numbered from 0 to 23 hours and 59 minutes.

The majority of modern watches have the feature of choosing the most convenient for the user time format - 12 or 24 hours, which can be changed at any time.


Type of wrist watch depending on its purpose. All watches can be divided into women's, men's and unisex models. In addition, there are children’s watch. All of these types differ from each other, of course, not by the mechanism, but by the appearance: size, color, design.

For men, watches is primarily a certain indicator of status. Men’s watches and bracelets designs are usually quite simple and strict; preference is given to a wide bracelet or strap.

For women, watches are often beautiful and fashionable accessory to complement her image. In most cases, women's watches are distinguished by a small case and thin elegant bracelet.

Unisex watches can be worn by both men and women. Typically, this type includes sport class watches (quartz models with extra features, and therefore with fairly big and wide case).

Children's watches have cheap plastic case and glass as well as lightweight durable strap. Most often, they have a bright colored casing, clear numerals and hands. The dial can be decorated with cartoon figures, crystals and other elements. The case does not necessarily have a strict geometric shape and can be presented in different variations of forms.

Type of mechanism

Type of wristwatches according to the operating principle. All watches by the principle of work are divided into quartz and mechanical.

Mechanical watches work by a complex interaction of wheel gears and springs. The mechanism itself has a long history. Despite the clever design, principle of the mechanism is quite simple. Probably, that is why such watches are considered the most durable: the lifetime of modern mechanical watches averages 15-20 years. In addition to durability, "mechanics" has another advantage: the watch does not require a power source - just wind it every few days. The disadvantages include more complex repairs because when working with small parts you need pinpoint accuracy.

Mechanical watches also require periodic adjustment and refinement, like the strings of a grand piano. In addition, these watches are not as accurate as their younger "colleagues" - Quartz models. Watch error is about 10-15 seconds per day, and accuracy movement itself depends not only on mechanism serviceability and degree of spring winding, but also on the ambient temperature, and even on the position of the case. Of course, for many narrow persons, this error is unlikely to be an important factor, but still the vast majority of people today prefer quartz watches.

The main element is a quartz crystal oscillator that generates electrical oscillations with fixed frequency. It is quartz crystal that provides high accuracy of the watch: watch error is no more than 20 seconds per month.

But quartz watches are very popular not only because of above said. Battery power resource is usually enough for a few years, so that the mechanism does not require winding. In addition, the manufacturer can somehow program microcircuit and equip watch with many additional features.

By the way, there is still no statistics on the lifetime of quartz watches, because this mechanism appeared just a few decades ago. However, even the first samples are functioning to this day.

Water resistance class

Degree of waterproof properties of wristwatches case. Generally, the degree of water resistance is set in pressure units (or atmospheric units). The manufacturer indicates the maximum load at which the watch case will not lose its tightness. For the sake of user’s convenience, atmospheric units are often converted into meters (1 atmosphere is equivalent to10 meters).

There are several classes of water resistance. You can choose the model depending on the type of activity and purpose of watches. WR watch allows handwashing; it is splash or rain resistant and so on. Here we mean minimum water impermeability, which is the typical for the vast majority of models. That is, the watch must be protected from small amounts of moisture during the elementary actions that accompany our everyday life.

WR30 (3 atm) watch is suitable for water-related work such as car washing and taking a shower. WR50 (5 atm), WR60 (6 bar) watches are suitable for swimming. WR100 (10 atm), WR150 (15 atm) are suitable for swimming and diving. Watches with WR200 (20 atm) rating are suitable for scuba diving.

As a rule, data on water resistance are listed on the reverse side of the case. However, it should be noted that the figures are given in accordance with laboratory tests. In reality, the watches, of course, are not subject to such pressures. Furthermore, the degree of water impermeability will depend on many factors: the presence of sealing gaskets, glass thickness, ambient temperature, etc. Over time, the parts wear out and, respectively, the level of moisture protection of the movement decreases.

Water-resistance watch

The availability of waterproof case in the watch. Water resistance is the property of the watch to prevent moisture from getting inside the case of the watch on clockwork. This setting will be especially important for absent-minded people, travelers and sportsmen. Since the tightness of the case is one of the main indicators of durability of the movement, the degree of water resistance appears to be an important parameter as well (see. "Class of waterproofness").

Weight (from 10.0 to 250.0 g)

Watchcase weight. Watchcase weight is directly related to its size (see "thickness", "height", "width") and depends on the number of parts and the material used. It is believed that the more expensive the watch, the less it weighs. This is not always true. For example, the cheapest watch made of aluminum of is much lighter by weight than the models made of steel. The watches with titanium case are as light as aluminum ones, the former being several orders of magnitude more expensive. Lightweight plastic watch can be both relatively expensive and very cheap - it depends on the type of plastic (see "Material of the case").