Here are some pictures and/or drawings of measuring devices from various makers. If the name of the submitter is underlined, you can go to the submitter’s web site. If you click on the picture of the measuring device you will go to a page that will give more explanation of the measuring device.

John Bokstrom’s Strip Measurer
(Thanks to Patrick Coffey)

Ron Grantham’s Depth Gage
(Thanks to Patrick Coffey)

Tony Spezio’s Depth Gage