3M 45179, Roloc Disc Pad TR, Medium 4 in 1/4-20 Internal, 7000045281 
Insize 1148-120, ELECTRONIC DEPTH GAGE WITH ROUND DEPTH BAR, 0-4.7″/0-120mm, 6928640347603
$386.45
Resolution: .0005″/0.01mm.
Supplied with three interchangeable points (flat, spherical, disk).
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.
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