Resolution .00005″/0.001mm.
Measure the groove diameter of shafts and keyways.
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 (except 0-1″/0-25mm).

3M 27260, Ultra Durable 5 inch Power Sanding Discs, Universal Hole, 100 grit, 7100188473, 5 per pack
3M 27719, Cubitron, II Roloc Durable Edge Disc 984F, 80+, YF-weight, TR, Maroon, 4 in, Die R400BB, 7100006569, 100 per case
3M 26128, PPS Series 2.0 Adapter, Type S33, 1/8 Female, 27 Thread NPT, 7100135950 