3M 22405, Roloc Disc 361F, P100 YF-weight, TR, 3 in, Die R300V, 7000045102 
Insize 3594-3, DIGITAL NON-ROTATING SPINDLE DISK MICROMETER, 2-3″/50-75mm, 6928640375224
$587.47
Resolution .00005″/0.001mm
Measure root tangent length of gear.
Non-rotating spindle
Button function: on/off, set, inch/mm, ABS/INC.
Data output. LR44 battery, automatic power off
Ratchet stop.
Supplied with setting standards.
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