I purchased the same caliper on Amazon. I think for its low price, this tool is a good value. As a test, I measured the known thicknesses and diameters of various U.S. coins (newly circulated, not old worn out coins). The caliper measurements were good, close, but not perfect. It would be nice to have a way to re-calibrate this caliper for more accuracy. Also, the caliper measurements go out to only 2 decimal places on inches (and only 1 decimal on mm). Not sure if other calipers go out to 3 decimal places in inches. Again, using U.S. coin dimensions as a standard, the specifications for diameter goes out to 3 decimal places. I know that I'm being too critical, especially for a tool that cost so little, but just saying. Best, Steve
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