1Design with Locking Knob: 360 degree locking structure can be locked at any angle, and the humanized design is more versatile in measurement. 2Lightweight and Portable: The ruler is exquisite and compact as a whole, and it is light and easy to carry and measure. 3High Quality: Use high quality ABS material, durable, LED high definition LCD large digital display measured data at a glance. 42 in 1 Design: A 2 in 1 combination of ruler and protractor, easy to measure, and a convenient tool for drawing and measuring. 5Easy to Use: Easy to fix, accurate measurement, convenient and practical, no need to worry about changing the angle when moving the ruler. Item Type: Angle Ruler Material: ABS Power Supply: 1 x CR2032 3V (Not Included) Measuring Range: 0.00 -999.9 Working Temperature: 0and50 Working Humidity: 85 percent RH Working Current: 20 A Resolution: 0.05 or 3' Accuracy: 0.5 Purpose: Angle Measurement 1 x Angle Ruler 1 x Manual Keep away from open flames! Delivered without batteries