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″. 
Related products
Measuring/ Inspection Instruments
Insize 4120-12N, METRIC THREAD RING GAGE, NO GO, M12x1.75, 6928640341786
	$48.09
	
			
		Measuring/ Inspection Instruments
Insize 4120-20, METRIC THREAD RING GAGE, GO, M20x2.5, 6928640341519
	$71.83
	
			
		
3M 72000, Breathe Easy High Efficiency P3 Particulate Cartridge 450-00-01R12, 7000131700, 12 EA/Case						
3M 77558, Cubitron II Hookit Cloth Disc 947A, 77558, 40+ to 120+, 6 in x NH, Die 600Z, 7100232737						
Insize 1179-1000, DIGITAL RTJ RING GROOVE CALIPER, inside diameter of RTJ ring groove .6-40"/15-1000mm, outside diameter of RTJ ring groove 1.2-40"/30-1000mm, 6928640394409						
3M 22409, Roloc Disc 361F, P120 XF-weight, TR, 1-1/2 in, Die R150S, 7000045103						
3M 76783, Cubitron II Hookit Cloth Disc 784F, 120+ XF-weight, 5 in x NH, Die 500X, 7100222757						
3M 22404, Roloc Disc 361F, 80 YF-weight, TR, 3 in, Die R300V, 7000045100						
Dynabrade 11684 Dynabelter Contact Arm Assembly 4" DIA X 5/8" W., 40 Duro Serrated						
3M 21639, PSA Cloth Disc 348D, 36 X-weight, 6 in x NH, Die 600Z, 7000148149						