3M 76631, Roloc Disc 777F, TR, 3 in x NH, 36 YF-weight, 7000028339 
Insize 1140-50, MINI DIGITAL DEPTH GAGES WITH ROUND BAR, 0-2″/0-50mm, 6928640387623
$197.56
Resolution .0005″/0.01mm
Measure depth of small groove and hole.
Buttons: on/off, set, inch/mm, preset (+,-).
Automatic power off, move the digital unit to turn on power.
Battery CR2032. Data output.
Made of stainless steel.
Optional accessory: data output cable
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