For most of my adult life I have admired well-made calipers and micrometers like these. Finally I made an investment and I see no difference in quality between them and the super famous Starrett brand. There is a helpful, short and direct video on YouTube on how to calibrate this particular element and if you are not familiar with micrometers it is worth taking the time to watch. In any case, they're a real pleasure to use - and I've found that now that I can measure the thickness of materials fairly accurately, I avoid problems with projects beforehand and solve others in ways I'm not into had considered. For example, my wife recently bought a plastic laminating machine to use at school for her students. Plastic laminate comes in different thicknesses. Now that I can measure the thickness of a social security card, for example, I can help her choose the right laminate so the result is strong enough but not too stiff. I also use it extensively at my hardware store. You can buy them without hesitation. However, make sure you save and read the instructions, treat the instrument with respect - you can't throw it around like a T-square - and you'll have a precision instrument to pass on to your teacher. grandchildren.
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