3M 30134, Spindle Extender Adapter 6 in Brush, 2 in x 1/2 in x 1 in, 7000046162 
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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