When working in the laboratory, I often end up with unknown screws. I could use a regular screw gauge to figure out the thread profile, but often when working with robots I don't know if the screw is metric or imperial and some of the profiles are fairly close.
I use the SCREW CHEK'R screw gauge to solve this problem. This handy tool that not only identifies the screw, but also lists the drill number for threaded and through holes.
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