3M 45097, Roloc Disc Pad TR, Extra Hard 2 in 1/4-20 Internal, 7000045284 
Insize 3127-E4, DIGITAL THREE POINTS INTERNAL MICROMETER, 3.5-4″/89-101mm, 6928640356391
$1,221.73
Resolution .00005″/0.001mm.
IP65 dust/waterproof.
Buttons: on/off, set, inch/mm, ABS/INC.
Data output.
LR44 battery, automatic power off.
Ratchet stop.
Optional accessary: data output cable, setting ring (part no. 6313), micrometer stand and clamp (part no. 6301 and 6301-2).
Related products
