a device attached to a drill bit to prevent the hole from exceeding a predetermined depth
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Examples from the Web for depth gauge
Historical Examples of depth gauge
There was another swift commotion, another opening and closing of valves, and the arrow on the depth-gauge leaped forward.