Our 3 point digital caliper is designed to measure the dimensions of router bits with 3 cutting edges.
The three point digital calipers allow you to get the precise dimensions of any Z=3 bit within moments once properly calibrated. Its unique design enables accurate measurement of the diameter dimensions of parts with odd number of grooves, such as end mills, taps, reamers, etc.
More information please click the link :4-40mm/0.157-1.57'' 3 Point Digital Caliper Tool Resolution 0.01mm/0.0005″ (precisionmeasuring-tools.com)
