Standard Abrasives 875711, MD Mini-Brush, 4-1/2 in x 2 in x 5/8-11 FB036 A XCS Medium Density, 7010292437 
Insize 1140-100, MINI DIGITAL DEPTH GAGE WITH ROUND BAR, 0-4″/0-100mm, 6940561934625
$254.69
Resolution .0005″/0.01mm
Accuracy: ?.0010″
No waterproof
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
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