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

Standard Abrasives 705998, Spiral Band, 3/4 in x 1 in 80, 7010331382
Dynabrade 78781 1/2" x 1/2"-W185 Dynacut Cotton Fibre Polishing Mounted Point, 120GFX, 10/pack
Dynabrade 55242 Vane Set (4pk) 
