Park Tool Digital Caliper Measure Accurately When it comes to bicycles, exact measurements are a necessity. The Park Tool Digital Caliper is a vernier caliper for accurately measuring seat posts, head tubes, bearings, spoke diameters, and other components. It features a large LCD screen for accuracy and ease of use. The tool's ability to measure in metric and inches in external, internal, depth, and stepped dimensions make it an indispensable shop tool. Features Range: 150mm, 6"Measures external, internal, depth and stepped dimensions Batteries: LR44UPC: 763477002594Manufacturer's part number: DC-2Related article: Chainline Concepts | Park Tool | Digital Caliper Park Tool | Digital Caliper Dc 1