At my work I learned to use a caliper well enough for my keying needs but when I found this used HPC micrometer available for a reasonable price on ebay it now has a new home. Using a metal key gauge on worn keys always left me guessing and reaching for the calipers. Just took this out of the box for a quick photo, will zero it and try it out on a few factory keys, it has a coarse and fine movement with a slip clutch. -Nick
