Resolution .00005″/0.001mm.
IP54 dust/waterproof.
Buttons: on/off, set, inch/mm, ABS/INC.
Data output. LR44 battery, automatic power off.
Carbide measuring faces. Ratchet stop.
Supplied with extension rods.
Setting rings are included (except part no. 3128-12).

Insize 3229-20, TUBULAR INSIDE MICROMETER, 19-20", 6928640356902
3M 28322, Clean Sanding Soft Interface Disc Pad, 6 in x 1/2 in 52 Holes, 7100005497 