Park tool digital caliper dc1park tools digital caliper is a precision instrument that will accurately measure seatposts headtubes bearings spoke diameters and much more made from stainless steel and a rugged abs composite body this digital caliper is a worthy addition to any home mechanics toolbox providing the ability to measure in metric decimal inch and fractional inch to cover all of your bases featuresmaterial stainless steel and abs compositelarge lcd displaydisplays metric