Here's a depth gauge standard for all that use a digital indicator that doesn't have a preset function (all you can do is zero it - ala Harbor Freight's). It's basically a 1/4" insert in a brass base. The insert has a 60 degree cone that is set so the theoretical point of the cone is exactly at the top of the brass base. Obviously, you have to have a hole in your depth gauge that's greater than 1/4" so the insert will fit inside.
Depth Gauge Standard
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