The caliper itself is top notch. A strong magnifying glass is useful (or necessary if you have poor eyesight) to see the vernier scale. I usually find three or four marks that are nearly aligned, then take the middle mark to read. Fine tuning can be used optionally and works well. As for the instructions and the case that comes with the device, the word pretentious comes to mind. You would think they would supply the inexpensive foam-lined plastic case that comes with some of the cheaper calipers ($15-$30), or at least make it available as an optional accessory. Fortunately, in terms of how-to guides, there are many good websites where you can find tutorials on how to use this type of caliper. A good way to check the accuracy or correct use of a caliper is to compare it to various feeler gauges from an automotive feeler gauge set. If you need to take a lot of measurements every day, a good dial or digital caliper might be the way to go. However, in terms of strength and accuracy, a vernier caliper is probably at its best when used properly. Alternatively, a caliper or good micrometer can be used to check the accuracy of a dial or digital caliper.
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