1. It can be locked at any angle to help you keep data when using it. 2. Laser-scale, clear and wear-.Battery, CR2032 3V lithium battery. 3. 0-360 Degree overall measurement.Stainless steel ruler with Inch and millimeter scales. 4. HOLD/Rev button: keep measuring angle. 5. On / off button: and hold the on / off button to turn off the power supply. Auto power off. Specification: Degree: 0-360 degrees Battery: CR2032 3V (not included) Working temperature: 5 Celsius - 50 Celsius Working humidity: 85% RH Accuracy: 0.3 degree Resolution: 0.01 degree Color: Silver & Red Material: Metal+Plastic Package Contents: 1 x Digital Angle Meter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.