Accuracy: 1% of deviation between workpiece size and setting ring, or example measuring inner groove of 21mm, use a 20mm setting ring for calibration, accuracy is (21-20)_1%=0.01mm
Eepeatability .0005″
Optional accessory: digital indicator
Suitable for contact point except 2436-200L, digital indicator, setting ring

3M 02140, Fibre Disc Backup Pad, TN Quick Change , 4-1/2 in x 5/8-11 Internal, 7000045746
Insize 2197, LARGE RANGE DIGITAL RADIUS GAGE, R1(4-590"/100-1500mm), R2(4-590"/100-1500mm), 697409778087 