NASA NTRS · 19730000150
A simple, accurate depth check guage
Abstract
Easily made, pen-light battery operated production check gauge has probe-activated switch with fail-safe features to insure proper operation. Parts can be reliably and quickly checked. Gauge is equipped with tolerance band adjustment and can use interchangeable probes for different applications. Accompanying tester permits frequent check of calibration.
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Rauch, E. P.. 1973-05-01. A simple, accurate depth check guage. https://ntrs.nasa.gov/citations/19730000150
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