3M 04020, Mini Mandrel 935, 2-7/8 in x 1/4 in, 7100009221 
Insize 1140-25, MINI DIGITAL DEPTH GAGES WITH ROUND BAR, 0-1″/0-25mm, 6928640387616
$178.13
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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