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″.

Norton 66261126299 - 2" X 50 Yard 80 Grit Metalite™ Aluminum Oxide Cloth Roll, 1 Each
3M 81356, Venture Tape White Aluminum Foil Tape 1558HT, 72 mm a 45.7 m, 5.4 mil, 7010335933
Standard Abrasives 727337, Zirconia Full Taper Cartridge Roll, 1/2 in x 1-1/2 in x 1/8 in 80, 7100092984
3M 94974, SandBlaster Large Sanding Tool, 463-000-4G, 3.7 in x 7 in, 7100140800
Insize 4120-20, METRIC THREAD RING GAGE, GO, M20x2.5, 6928640341519 