Takes length and diameter measurements two ways: outside and inside. Button switches display from inches to millimeters. Made of acid resistant, non-conductive, strong, carbon fiber composite. Large digit display is easy-to-read. Use the zero button to set a reference point which enables ‘greater than’ and ‘less than’ readings (displays negative sign). No lubrication is ever required on the ultra-smooth slide bar. Complete with a Traceable^® Certificate and a battery.

Specifications
Accuracy: ±0.01 inch (±0.2 mm)
Resolution: 0.01 inch (0.1 mm)