Description and principle of operation of an electronic caliper, advantages of a digital tool

Application areas of the tool

Electronic calipers are used to obtain internal and external dimensions of elements. And if the device is equipped with a depth gauge, then it can be used to measure the depth of a number of holes. As a rule, the measurement range of an electronic caliper coincides with the parameters of its mechanical counterpart.

They use a direct measurement technique, which allows you to obtain extremely accurate dimensions of the product clamped into the part. For measurement, the device is equipped with three control systems:

The first is special jaws that allow you to determine the external dimensions of the part in question. When taking measurements, they clamp it, securely fixing it, and the digital display displays the corresponding value.
The second system is jaws designed to measure dimensions inside an element. Their measuring planes are located in a different direction, and during operation they need to be separated as much as possible.
The third system includes a depth gauge, which is a metal rod.

It should also be noted that each of the systems moves simultaneously with the others. The production of these products is regulated by the GOST standard 166–89.

Modern electronic calipers are protected not only from moisture, but also from dust. In addition, they do not conduct electric current through their structure. There are even devices for left-handers on the market.

Electronic caliper with depth gauge

This device is used to measure internal and external measurements, as well as between the surfaces of parts, used to measure the depth of holes and protrusions. An electronic caliper has a very useful function compared to a mechanical one - it is adjusted to zero at any point on the scale, thanks to this you can observe deviations in each area of the size. That is, you can reset it to zero at, say, 21.55 mm, and then count the length from it.

In modern high-precision mechanical production, it is no longer possible to do without this convenient tool, where the measurement range is universal. In heavy and light industry, construction, and in all other branches of technical life, it is no longer possible to imagine work without the use of a digital caliper. If necessary, a computer can be connected to the ES, to which all data will be output during the size control process. For this purpose, the digital caliper has a special connector:

The digital caliper has a resolution of 10 microns with an accuracy of 30 microns. This accuracy is achieved using capacitive sensors. Capacitive sensors are very linear and immune to mechanical and electronic interference. However, they are sensitive to liquid. Accidentally entering liquid will unbalance the measuring bridges of the plates and increase the capacity.

Benefits of Vernier Calipers

One of the main advantages is that the electronic caliper displays size information. In production, this is an extremely useful characteristic, because the speed of work is very important there. The digital display also makes it easier for beginners because there is no need to learn and master how to use a mechanical caliper. Due to the fact that an electronic product has several measuring systems at once, it can be used in a variety of areas, because few devices can simultaneously measure external and internal dimensions, as well as depth, producing highly accurate values.

The electronic type of caliper, as a rule, has compact dimensions, which affects its weight. Accordingly, there will be no discomfort when working in hard-to-reach places. The digital device also has additional capabilities, such as built-in memory, measurement converter, connection to external equipment for information transfer, etc.

Which caliper is better - electronic or simple?

At the moment, there are only a few types of calipers, these include: electronic, vernier and dial. Recently, most buyers choose electronic calipers, as they are more functional and convenient to use. But lovers of reliability and simplicity remain faithful to vernier instruments.

Working with the latter option is really as easy as pie, because the device consists of only one ruler-bar with a measurement scale and a vernier.

The design includes a measuring part (jaws), a ruler and an auxiliary scale for counting tens and hundredths

A dial caliper is almost in many ways similar to a classical instrument, however, a special dial is installed on the moving part, indicating the measured value of the part.

It is also simple and convenient to use, and the specialist’s eyes are less tired during work.

Electronic calipers are more advanced and functional. As a rule, it is equipped with an auxiliary sensor and a display, which is necessary to display parameters.

The main advantage of this type is high accuracy and durability.

Equipment disadvantages

The performance of this technique depends on the power source, which interferes at the most inopportune times. Also, the price of the device is much higher than that of a mechanical tool, which determines its predominantly professional scope of application. The device is highly sensitive to drops, vibrations and mechanical impacts, because these factors affect the condition of the electronic data reading device. Failures associated with the software environment can also lead to loss of functionality.

Equipment shortcomings, as a rule, only apply to cheap Chinese-made models. Experts note low wear resistance, poor quality and fragility of the material. In some situations, there may be jumps in readings on the display, as well as confusion in hundredths of values, so to work with such a device you need to have some skill. However, expensive and high-quality calipers do not have these disadvantages.

What to choose - an electronic caliper, a regular one or a micrometer?

Vernier calipers are used to take measurements of various parts of parts with a reliability of up to 0.1-0.01 millimeters. A more accurate, sensitive (contact) measuring instrument is a micrometer. It can set dimensions precisely down to thousandths of a millimeter. It should be borne in mind that a micrometer will not be able to measure a part larger than 50 mm. Just as you shouldn’t expect the accuracy of a micrometer from a caliper (even an electronic one), due to its design features.

Conventional calipers allow you to measure parts up to 40 centimeters in size. There are also special huge instruments that allow you to measure objects up to two meters in length.

According to the authoritative opinion of professionals who shared their observations with colleagues on the Internet, measurements with calipers are considered only as secondary and approximate. Only calculations using a micrometer can be considered error-free, which is classically used in cases where exceptional and genuine dimensional accuracy is required. But sometimes modern innovations may well compete with old time-tested means.

For non-professionals, ordinary calipers with a division value of less than 0.1 millimeter are not of particular interest, since it is almost impossible to see the differences between 12.05 and 12.1 mm by eye. However, technological progress does not stop, and it is not surprising that a new electronic modification of this device has appeared on the market. Now models with an accuracy of up to 0.01 mm have begun to be produced. This new product is produced in China, Germany, Japan, Switzerland and other countries.

Some of our compatriots have already appreciated the ease of use of such a caliper. As noted in their test measurements, the digital caliper has a number of advantages and useful properties. Almost everyone agrees that working with a modern electronic model has become faster and easier. But a new product does not always take root in production - many professionals recognize such devices as fragile and return to old, time-tested models.

And home craftsmen are happy to use the fruits of progress. But it is advised to choose models made of durable materials if you plan to use the device for more than one year. For one-time use, the simplest and cheapest Chinese model is also suitable (of course, it would be advisable to check the accuracy of measurements and build quality before purchasing). Let's now take a closer look at the design of this instrument.

Design features of the device

The main elements of a digital measuring tool are similar to those found in standard models, but there are a number of electronic parts . In general, a digital caliper includes:

sponges for measuring internal surfaces;
sponges for measuring external surfaces;
barbell;
mobile frame;
power source (battery or accumulator);
roller that allows you to change the length;
reset button;
on/off button;
inch/mm switch button.

The availability of additional options and buttons depends on a particular model. Some instruments even have modules installed to transmit information via wireless technology. In general, the main elements are identical for all devices.

In order to see the information obtained during measurements, you do not need to strain your eyes and peer - the contrast and high-quality screen displays large digital symbols, which is extremely convenient in low light conditions or problems with vision. The ruler of the electronic caliper has an additional scale in millimeters and inches, so it can be used even when turned off.

Rating of digital calipers

A large number of well-known organizations are engaged in the manufacture of electronic calipers, and each introduces different parameters and auxiliary functions designed to increase accuracy. According to experts, the ideal tool is one that has an accuracy of a hundredth of a millimeter. The vast majority of instruments are equipped with displays, as well as correction sensors necessary for flawless display of values.

Important! Taking into account the characteristics of various models, as well as the opinions of professionals and customer reviews, a rating of the best electronic calipers for household and industrial use was compiled.

Best Premium Digital Calipers

FUJIWARA is one of the best manufacturers of calipers. The material for the FUJ-SXKC-01 model was stainless steel. The range of the measuring rod is 0-150 mm, and the scale accuracy is 0.01 mm. The main feature of the caliper is the IP54 waterproof coating layer of the frame. Accordingly, the caliper can be used outdoors during rain. As for immersion in water, experts do not recommend this, since the battery compartment is not sealed with rubber plugs. The device does not have an automatic shutdown function, but in some ways this is an advantage, given the regular problems with this option. The device turns off automatically within six minutes.

The model is treated with a waterproof coating

Most users note the excellent build quality of the device - the jaws are precisely aligned, the design works without backlash. By bringing the calipers together, the measurement sensor resets itself to zero. Of course, there are some drawbacks here: the depth gauge fastening screw does not tighten all the way, the wheel does not fit correctly under the thumb. There are small errors in the accuracy of the element; if used correctly, it is three hundred square meters. The cost of the product is 2790 rubles.

MITUTOYO ARMATURE FRONT is probably the best electronic caliper that can be ordered from Aliexpress. Initially, the high cost catches your eye - 2690 rubles, however, this is compensated by the excellent build quality. The instrument features a wide measuring range, stainless steel coating and a large digital screen. The accuracy of the measuring element is 0.01 mm, and the extended range is 0-300 mm. The manufacturer produces several versions of the device; there are models with a range of 0-150 mm and 0-200 mm. Inventory is selected depending on the goals set.

SC is equipped with an extended measurement range

The kit includes a caliper, a stylish box, a leather case and a battery. Mitutoyo products are most valued for their high precision and high-quality assembly. All nodes of the ruler sit firmly in their places, there is absolutely no play. The only drawback is that from time to time there are models with defects.

WANHENDA DIGITAL METAL CALIPER – the measurement accuracy of this tool is two hundred. Stainless steel served as the main material for the rod. The appearance of the element leaves a pleasant impression; on the rear panel there is a diagram containing hole standards. The ShTs goes on sale in a convenient case, inside of which there is a rubber cover and compartments for auxiliary parts.

One of the best measurement accuracy

Buyers note the Wanhenda Digital Metal Caliper as a tool with a smooth and soft ruler stroke. The assembly was carried out reliably, the design does not play. Experts assure that this model was tested using professional micrometers. The test results confirmed the high accuracy of the device, its error does not exceed one hundredth. The downside of the kit is the weak protective case, which will quickly wear out during use. The price of the set is 830 rubles.

The best mid-priced electronic calipers

JIGONG JIGO 150 is an excellent stainless steel caliper that has a large display and measurement accuracy of 0.01 mm. The tool is turned on using the power button or by smoothly moving the caliper. The set includes a large AG-13 battery, a plastic case and instructions for use in English. This caliper is not suitable for professional measurements, so it is better to use it at home.

The model is characterized by a smooth wheel motion

The main advantage of the Jigo 150 is the high-quality assembly of the structure. The nodes sit securely in their places, the ruler moves smoothly, no backlash is detected. The cost of the set is 800 rubles.

KETOTEK VERNIER CALIPER is another decent caliper with a measurement accuracy of 0.02 mm and a stainless steel housing. The appearance of the caliper looks expensive; it comes with a high-capacity LR44 battery, a plastic case, a stylish case and a screwdriver for fine adjustments. It is worth noting the good quality of the case, which makes the instrument ideal for a gift.

Shts has a stylish design

Buyers appreciate this caliper for its high strength of materials and good assembly, however, they speak negatively about the presence of backlashes. There is a small measurement error - in the region of one hundred square meters. Also noticeable is the battery cover, which is difficult to open. The price of the tool is 770 rubles.

HILDA VERNIER CALIPERS is a good model that combines a good ratio of quality and price. The accuracy of the measuring part is two hundred parts, the range is 0-150 mm. It is worth warning that the main material of the product is plastic. Tools of this type are not suitable for precision work; otherwise, you need to choose metal models. The scope of delivery is modest - there is no battery or case.

There is an automatic reset of values

The tool is equipped with a locking function and automatic start. Switch between inches and millimeters with just one click. By bringing the rod jaws together, the indicator returns to zero. The main disadvantage of calipers is the fragility of the structure and the presence of backlashes. The tool can turn on by itself during transport. The cost is 280 rubles.

The best electronic calipers in the low price range

The next tool that ranks among the top best calipers is the QSTEXPRESS QST 008, which is made of durable plastic and has a special coating on the jaws of the rod. Thanks to this coating, the tool can withstand moderate mechanical damage. The range of the meter is 0-150 mm, and the accuracy is 0.02 mm. The caliper is turned on due to the movement of the jaws. There are four measurement options: external, internal, depth and pitch. The case is equipped with a small screen and a reset key.

Ideal model for household work

The delivery set includes a case and a caliper; there is no protective case. Among the disadvantages of the tool are the standard paint on the ruler, which quickly wears off, and the plastic construction. Price – 245 rubles.

XINGWEIANG XWQ K150 is a good measuring unit, providing an accuracy of 0.01 mm. The caliper is small in size and has a large LCD screen. The design is made of plastic, but despite the cheapness of the material, the body is durable and reliable, there are no backlashes. Of course, the XWQ K150 is not well suited for precision work, however, it is useful in everyday life.

Excellent combination of quality and price

The disadvantage of the tool is that the set does not have a battery or a protective case. There is also a lack of a rod lock, average build quality and a high error of 0.02 mm. Before purchasing a caliper, you should stock up on LR-44 or SR-44 batteries. The cost of the ShTs is 250 rubles.

The budget caliper TONGFENGLH FEN-056 closes the rating of cheap tools. The material for the case is durable plastic, and the measurement accuracy is two hundred parts. The instrument is very simple to operate, since all the necessary keys are located near the display - zeroing, turning on and switching millimeters/inches. The small dimensions of the device are worthy of attention; thanks to this, it fits comfortably in the hand.

Has minimal measurement error

Buyers emphasize the high accuracy of the caliper and the absence of errors. Batteries and a protective case are not included, so be careful during transportation. The plastic case is characterized by good strength and wear resistance. The disadvantage of the caliper is the presence of defects on the jaws of the rod, as well as the presence of backlashes. The build quality of the case is average. The price of the product is 190 rubles.