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 26137, PPS Series 2.0 Adapter, Type S41, Trapezoidal Thread - QCC, 7100135947
Insize 4180-500, MAGNALIUM STRAIGHT EDGE, length 20", 6928640320545
Dynabrade 95675 1/4" Male Plug with 1/4" NPT Male Thread 