6"/150mm Electronic Digital Caliper (3 Key) Auto power off or manual on/off key. Three-key model including inch/mm, on/off & zero. Switchable inch/metric on a high contrast easy to read LCD display. 4-way measurements: Outside, Inside, Depth & Step. Floating zero. Body and scale are hardened stainless steel. Zero setting. with fitted case. Meets DIN 862 Accuracy is .001"/.03mm. Replacement battery is item #4102-0030.