* Inductive measurement system * IP67 protection grade, caliper can work reliably in hard environment * Built-in rechargeable lithium battery, magnelic charging port * Built in bluetooth transmission (optional)

* Inductive measurement system * IP67 protection grade, caliper can work reliably in hard environment * 3V Lithium battery CR2032, battery life> 1 year * Built in bluetooth transmission (optional) * Resolution 0.001mm, accuracy 5μm in each 1mm