depth gauge

noun

a device attached to a drill bit to prevent the hole from exceeding a predetermined depth

He watched the story the depth gauge told with narrowed eyes, and, as it reached three miles, inspected his rifle.

There was another swift commotion, another opening and closing of valves, and the arrow on the depth-gauge leaped forward.

As if transfixed our eyes sought the hand of the depth gauge.

Rick consulted his wrist depth gauge, holding it close to his face plate.

For tonguing, the bit shown in Fig. 2744 is employed, the depth gauge g being adjustable in the groove by means of the slot shown.

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