Review on Adoric Digital Calipers for Precise Measuring by Sasha Hsiao

I confess honestly: I had two good, Soviet calipers and even one micrometer. And he simply blew them away, leaving them in an old apartment, where dishonest lodgers made them legs. To be honest, at that period of my life it seemed to me that these things, intended for various technical creativity, would never be useful to me. But it is not in vain that it is said that everything develops in a spiral, life has gone on the next round, and now again there is a need to do a lot with your own hands and engage in all sorts of technical handicrafts. And at the same time without a caliper as without hands. So the purchase of this electronic device (not to be confused with gadgets!!! :)))) was actually predetermined. The problem arose only in choosing the most suitable tool. There was no doubt that it would be electronic, since it becomes more and more difficult to read small strokes on a manual caliper with age. But which one to choose: all-metal, solid or almost toy plastic? On reflection, I decided that high accuracy is completely useless to me and an obscenely inexpensive "carbon" small caliper sold in many stores on Aliexpress is quite enough. And here it is in my hands. Packed in a simple plastic bag, all black, as ordered. Well, it's time to arrange an interrogation with passion, debunk the myths that roam around him. Myth 1. Carbon or plastic?! Of course, this is a simple ABS plastic, it bends quite easily, which cannot be with carbon. And there is no carbon texture at all. The plastic is of sufficient quality, only the depth gauge pin is very, very flexible, which will bend when measuring deep objects. So it is better to measure such with a more accurate device if an accuracy of more than a millimeter is required. Myth 2. The caliper is made carelessly and due to the unevenness of the jaws it has a huge error. I don’t know, maybe frank slag comes with Aliexpress. But on my copy there are no burrs or any other negligence. No, I’m lying, there is, the ruler is made in the form of a glued film and this film leaves a little bit at the end of the caliper, see photo. True, this film does not affect the accuracy of measurements in any way and performs a purely decorative function. As for the unevenness of the jaws, here is my test: we move the jaws apart by 0 1mm and look at the uniformity of the gap. I think everything is fine. Now we bring the lips together and repeat the test, I didn’t see any gap, everything closes tightly and accurately. And no matter how many times you open and close the caliper, the initial value always shows 0.0. So there are no complaints about the device here. Myth 3. It is impossible to measure hundredths of a millimeter with this caliper. And what did someone promise more? The caliper, in principle, is not capable of indicating hundredths of a millimeter, its error is + -0.2 mm ... This is clearly written on the back side sticker. By the way, mechanical Soviet calipers have exactly the same accuracy and only hundredths of a millimeter can be caught on them by people with a rich imagination. There are also calipers on sale that show hundredths of a millimeter, but to be honest, I can’t imagine how you can measure with such accuracy. The very design of the caliper does not allow you to clearly fix the size, it is no coincidence that the micrometer measuring hundredths has a completely different design, which allows you to clearly fix the measured part. Although, of course, the locking screw in the considered caliper did not interfere, since the slightest careless movement during measurement and the readings go astray. Well, this is another topic, the caliper works out the accuracy of 0.1mm clearly. Myth 4. At the end of the stroke, the measurement error can reach several millimeters. This is complete nonsense, the mechanism itself is designed in such a way that it does not matter where to measure, at the beginning of the stroke or at its end. Here we measure a drill with a diameter of 10 mm, in reality it is 9.9 mm. Now we measure one of the sides of the metal square. We get the value of 131.8 mm. We add the diameter of the drill as a result we have 141.7 mm. We check. As you can see, the caliper is equally accurate both when measuring 10mm and 140 millimeters. By the way, the limit of its measurements is not 150mm as indicated, but a little more, see the photo of the maximum measurement limit. Let's check the accuracy of depth measurement with the same drill. Myth 5. You can use lr44, sr44 and cr2032 batteries for power. I read about it in the product description on the seller's website. While the package was in progress, I wondered how it was possible to combine such different power sources. But everything turned out to be simpler: LR44 and SR44 having the same size and voltage are standard. But cr2032 cannot be stuffed into the battery compartment in any way. And the voltage of this element is twice that of the regular ones. It is possible that some other models of calipers use the CR2032 element, but definitely not in this model. What else can you say about this device? Yes, in general, everything is already clear and understandable to anyone who has dealt with any other caliper. The numbers on the display are large, so now you do not have to strain your eyes looking for matching risks. Three control buttons. Zero updates readings at any carriage position. This is in case you need to measure not the absolute thickness of an object, but the difference in its change. Measure the minimum thickness, press the zero button and look for how much the thickness changes in other places. The on off button naturally turns the device off. After pressing it, the display turns off. But the slightest movement of the carriage, even if you casually put the device on the table, turns it on again. However, this is not scary, because after a few minutes of inactivity it turns itself off. The top button switches the units of measurement from millimeters to inches and vice versa. The corresponding icon lights up on the display. To sum up: the Aliexpress caliper meets all the stated requirements (except for the material of manufacture, but you didn’t seriously think that it was carbon?! :)))). It is convenient to use it, its accuracy for domestic needs is satisfactory. Batteries used are common and inexpensive. The only thing missing is a retaining bolt. In general, I highly recommend, a good unit.