Feature: 1. Design with Locking Knob: 360 degree locking structure can be locked at any angle, and the humanized design is more versatile in measurement. 2. Lightweight and Portable: The ruler is exquisite and compact as a whole, and it is light and easy to carry and measure. 3. High Quality: Use high quality ABS material, durable, LED high definition LCD large digital display measured data at a glance. 4. 2 in 1 Design: A 2 in 1 combination of ruler and protractor, easy to measure, and a convenient tool for drawing and measuring. 5. Easy to Use: Easy to fix, accurate measurement, convenient and practical, no need to worry about changing the angle when moving the ruler. Specification: Item Type: Angle Ruler Material: ABS Power Supply: 1 x CR2032 3V (Not Included) Measuring Range: 0.00 ~999.9° Working Temperature: 0℃～+50℃ Working Humidity: ≤85% RH Working Current: ≤20 μA Resolution: 0.05°/3' Accuracy: 0.5° Purpose: Angle Measurement. Package List: 1 x Angle Ruler1 x Manual Note: Keep away from open flames!Delivered without batteries