Spurtar Vernier Caliper Measuring Tool 6" Stainless Steel, 0-6Inch/0-150mm Manual Non Digital Calipers, 0.001"/0.02mm High Precision Durable Micrometer

Very impressed when I first open up the box. Great for the garage and fabrication of parts for cars. Works very well and for the price it is a great value.

These are nice. I was expecting something cheap and oily from some of the product reviews, but they seem fine to me and are a really good value. No complaints for the price. The calipers even come with a carry case, a metal ruler, and a small cloth to wipe down the caliper.

These don't have stellar calibration when received. OK after adjusting. It's great that no batteries are needed. Centimeters are easier to read, since they're divided into millimeters and tenths of a millimeter. Inches are divided into tenths, then quarters of a tenth each subdivided into 25 thousandths, which takes slightly more brainpower to decode.

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OK, as I said, I'm not a technical engineer who has any real experience, or need, for a tool like this. So I'm just giving my opinion overall. I build R/C aircraft, and a set of calipers can come in handy many times when I'm trying to duplicate the sizes of something.I did some research on calipers, and from what I read and watched this is a fairly decent caliper. One point I learned was checking the zero point match, and they do on this set, and that there is no visible gap between the jaws when they are closed, and there weren't, so they appear to be accurate.The instructions tell you to lube the contact points with clock oil, and I used sewing machine oil (same thing I would guess) and I actually did it BEFORE I read the instructions (Hey, I'm a guy, all right?) because the calipers were a little "scratchy" feeling as I slid them back and forth, it was much better after being oiled.I tried measuring a set of feeler gauges to test the accuracy, and what I read on the calipers matched what was etched on the feeler, so the calipers seem to be as accurate as I would ever need.I also love the 6" ruler that came with it, I have several of that size, but they are hard to read (don't get old!) and this one is nicely marked and easy to read. The case it comes in is great to have to keep the calipers protected in my toolbox too. I'm satisfied with them.

Quality seems excellent. My HF digital caliper also claims 001" precision and also shows the next half-thousandth (.0005"). It matched this vernier caliper, nearly always to the half-thousandth. And two other inexpensive calipers matched this vernier caliper. The one I received seems to be built correctly in contrast to some other reviews.However - I thought I could read Vernier, I learned on pre-electronics land survey instruments long ago. But the graduations on the Inch scale are so close that I mis-interpreted the reading, about one-third of the time.And note you will need a magnifier - I use a jeweler's headband stereo magnifier - to see the reading.I would write down what I thought was the measurement. Then the digital caliper, about a third of the time, would show at least .010" larger. Back to this vernier caliper, I found a matching tic at that larger measurement that also was as perfect a match as what I had relied on.One workaround for this mis-reading is to look at the measurement on the coarse scale and estimate between the tics, for example 60% of the way to the next tic. Then go look for a perfect match on the fine scale. In the example of 60% that will be about +.014". (60% x .025" graduations).This thing is definitely Old School. No battery needed, which is why I bought it. But the need to use a magnifier to read it makes it less convenient than the modern digital one.I watched a YT video explaining a Starret (famous quality brand) vernier caliper and I see the Starret is easier to interpret. Its coarse graduations are .050" while this one has .025". And its fine scale is twice as long with larger graduations, so its easier to see where tics match. With good eyesight a magnifier wouldn't be needed.The ultra-small graduations are not only hard to read. Coarse graduations of .025" plus adding a number 0~25 from the fine scale to arrive at total measurement is more confusing than I expected and prone to error. The Starret, for inches, and the mm scale on this, are easier math to work in your head. If you don't understand this paragraph then a vernier caliper isn't for you!Overall - a quality tool but for purists. For general use go to HF and get their .001" digital caliper, and some spare batteries. Several reviews here rate that tool better than other inexpensive digital calipers.I gave up and returned this. Expand the photo at the head of this listing. (And you will need an excellent magnifier to see anything like that). Is that showing 0.670" +0.001? +021? +.022? I can't measure with thousandths precision because I can't distinguish which tick is best. I made too many errors compared to using the digital caliper which was unambiguous.

Great product, good accuracy, perfect for 3d printing.