For zero setting of inside micrometers, three points internal micrometers and bore gages.
Deviation is the difference between the ordered size and the size marked on the setting ring when supplied.
For example, the ordered size is .2”, the size marked on the setting ring when supplied may be .20008″.
setting ring when supplied may be .20008″.

3M 27468, EMI Copper Foil Shielding Tape 1181, 1 in x 18 yd (25,40 mm x 16,5 m), 7000132169
Insize 4807, ANGLE GAGE SET, 6928640319341
3M 45098, Roloc Disc Pad TR, Soft 1-1/2 in 1/4-20 Internal, 7000045277 