Digital Vernier Caliper, Preciva 150mm Electronic Micrometer Vernier Caliper, Measuring Tools Caliper Gauge with Mm/Inch Conversion High Precision

Easy to use checked against my other calipers spot on

Bought these to replace an old analogue set of vernier calipers that were worn and becoming difficult to read. First impressions: these digital ones are great! It makes it so easy to read measurements - internal, external and depth measurements, as well as length of 'steps'.Really easy to use. These ones come in a nice box with a spare battery, a small screwdriver and fairly decent instructions. You can turn them on/off at a touch of a button or just move the thumb wheel and they will come on. The battery cover just slides off using your thumb.What I do like is that you can zero the calipers on the current size at the touch of a button. So if you have a number of things that should be the same size, zero it on one and then when you measure the others you get a direct comparison without having to do the subtraction. They can also be locked in place at one reading using the top locking screw.I have checked them against my old calipers and they certainly seem accurate enough. Officially they are accurate to 0.02mm although, realistically, accuracy of 0.5mm will be good enough for me for most things. They can also be easily switched between inches and mm.I do like tools that just make the job that bit easier and these do that. While analogue scales are not difficult to read it can be easy to make silly mistakes and the very clear digital readout of these removes that possibility. These feel solid and well made. Very happy with them!

It is nicely engineered and feels right in the hand. Slightly ‘left hand’ heavy but acceptably so.OUTSIDE MEASURING JAWS: On holding it up the light, I can see that the machining is perfect. The gap, when virtually closed is absolutely even.INSIDE MEASURING JAWS: This is always more difficult to check because you need to look through the gap at a slight angle. It does however appear that the gap is not perfectly even. It is less than a thousandth of an inch out, by my eye-ball, and perfectly acceptable for my needs. There is a very slight roughness to the measuring surface which probably accounts for this. The 'error' will soon be nullified by normal wear and tear, so it really is not of significance.STEP MEASURING SURFACES: The calliper stands on end absolutely square - so the step surfaces are precisely made.DEPTH MEASUREMENT: Absolutely flush with the jaws held closed - just as they should be. The slider is slightly wobbly in the body but that does not affect the accuracy. Better that way that stiff.IN USE: The jaws can be held in place firmly with the thumb on the bulge under the display. Ergonomically, it is just right. The fine adjustment wheel is indeed a proper working wheel and not just a dummy plonked on there to make it look good. The locking screw works easily without having to apply too much pressure. Full marks then to Preciva for the design and engineering.THE LCD DISPLAY: It’s big and clear but it does not work well in cold weather. Anyone expecting to regularly work in the cold would be better off with a Vernier calliper or a Dial calliper. The manual says 5°C to 40°C operating temperature and it was less than that when it was delivered so, fair enough, it didn’t work properly.Whether you turn it off manually of leave it to turn itself off, it turns itself on again as soon as you move the jaws - which makes the on/off switch almost redundant. If you are travelling with one of these it may be a good idea to lock it with the top screw to stop it turning itself on all the time and flattening the battery. Remember not to close it right up though or you risk straining something. CR2032 batteries are pretty cheap and they give you a spare battery as well as the one fitted when it arrives. With a bit of care, battery life should not be an issue.MY FIRST ONE WAS FAULTY: I noticed that when pressing the 'ZERO' button, the display always said '7.77' or ‘0.01’ instead of '0.00'. Measurements sometimes worked normally but in some lighting conditions it was all too easy to see the parts of the LCD that you should not be seeing - which makes reading it a bit worrying. Having realised that problem, I gradually opened up the jaws beyond my normal range and I noticed that there were a great number of random readings appearing. Far too many to be acceptable, so my first one had to go back. Fortunately, the replacement is a brilliant tool at a bargain price.ACCURACY: To test the Preciva, I measured three drill-bits (5.00 mm, 2.50 mm, 1.20 mm) with 5 different devices. I measured each shaft three times with each of the 5 instruments - i.e. 15 measurements of each object. The table below shows the average result in millimetres. (The table may not survive re-formatting by Amazon so read carefully).NOMINAL SIZE: 5.00 2.50 1.20Vernier Micrometer: 4.957 2.508 1.200 These readings did not vary.Vernier calliper: 5.02 2.54 1.26 These readings did not vary.Plastic calliper: 4.70 2.30 1.10 Varied by 0.20 over three readings.Faulty Preciva calliper: 4.94 2.49 1.18 Varied by 0.10 over three readings.Second Preciva calliper: 4.96 2.50 1.19 Varied by 0.02 over three readings.The micrometer readings and the Vernier calliper readings were absolutely consistent. The Faulty Preciva and the £5 plastic digital calliper varied with each reading but the Replacement Preciva varied only very slightly…On the ‘5.0’ mm object it varied 0.02 mmOn the ‘2.5’ mm object it varied 0.01 mm.On the ‘1.2’ mm object it varied 0.00 mm.The measurement ‘error’, if error it really is (probably is), is a maximum of 0.01 mm. All of those results are pretty damn good for a budget calliper!My Vernier micrometer reads '0.00' when closed right up, using the torque limiter. I would guess therefore that it is reliably accurate at these small measurements. On that assumption, the Preciva calliper is more accurate than the Vernier calliper(!) and it is of course much quicker to read than the Vernier calliper. Very rarely will I need anything more accurate than the Preciva and if I did, I would be using a micrometer anyway – so the Preciva is a bargain!CONCLUSION: It is a shame about the faulty LCD on the first Perciva but the replacement one is a gem. Highly recommended and well worth 5 stars at that price.The £5 plastic calliper result was interesting. It is the least accurate, as should be expected, but for most purposes, it is good enough. How often do you REALLY need to measure closer than 0.3 mm?PLEASE NOTE THAT THE PICTURES ARE OF THE FAULTY ONE. THE REPLACEMENT IS 'PERFECT'.

That is an an excellent tool for value overall but, beware that it consumes battery even if it is off. And suddenly, you think it is faulty because it acts up when the battery is low... best to keep batteries out while not using. the even included a spare battery knowing this =D

I did a review of this product on youtube and showed how I carried out various checks.Using a 50mm engineers block I checked accuracy and repeatability of main jaws 49.98 to 50.0 readings which are within spec and indicate pretty good flatness and parallel machining of main jaws.Inside measurement jaws were not so good - the flat faces have a gap meaning the measurment axis is not inline with the points of measurment, this is worse for small items. There is a 0.06mm difference between the main jaws (which you use to zero, and the inside jaws, which are therefore actually out of spec, the inside jaws are difficult to zero separate from main jaws (they don't fit in a hole that has no size).Depth gauge/step - this end face is quite crudely ground and setting this on the engineer table it is easy to measure that the "plunger" is 0.05mm short of the end of the body, unlike the inside jaws you can probably zero-out this error.I had to tighten two screws in the body that they had forgotten to do in the factory (under the label) and on delivery the slide section was a bit wobbly because they had not properly tightened the top two screws that adjust the slider friction. After doing this it made the faces parallel and it works pretty well.I was disapointed in the attention to detail in the manufacture but accuracy and repeatablity are ok for the main jaws. For the price it is acceptable and better than the budget devices

I got this over Covid when doing repairs and getting stuff by post. Great product at a hood price. Digital readout is good, has a zero and on/off function, good for internal and external readings, comes is a plastic case suitable for protection. I used it loads of times, battery ran out. Advice, get a second replacement battery and store with battery not in place.

I get through one of these things every 12 months or so and I’m still looking for something that offers a good compromise between cost and life. This is not it. Display stopped working as soon as it got hot, resulting in random completely wrong values.Probably ok for home workshop use - rubbish for anything more arduous

Very nice