The Brown & Sharpe Twin-Cal IP40 Digital Caliper has a measuring range of 0-12"/300mm with a Square Depth Rod and Thumbwheel. These calipers feature IP40 level protection from dust. Equipped with built in Twin wireless functionality that provides Swiss quality and design at an economical price. Additional functionality is built-in with the revolutionary new Twin wireless connectivity solution. Absolute and differential measuring system, a large LCD display for easy reading, durable stainless steel frame, automatic shut-off, instant inch/metric conversion and an approximate battery life of 1.5 years.