Accuracy GUARANTEED to be within .001" throughout entire range. Instantly read the width of chamfers and bevels on straight AND circular edges direct to .001" Because the gage operates against independent springs, operator feel and judgement is greatly reduced or eliminated. For straight edge measurement, no master is necessary. For curved pieces, use a part with a "zero" radius or chamfer, to set the "zero" on the gage, or use a qualified part.