What's your seatpost size again? Park's Digital Caliper accurately measures seatposts, head tubes, bearings, spoke diameters, etc. It's a precision instrument built accurate to 0.01mm with a stainless-steel mechanisms and a rugged composite body. The tool’s ability to measure in metric, decimal inch, and fractional inch makes it an indispensable home workshop tool. It features an automatic shut-off and comes with a protective sleeve and the battery.