XIANQI High quality material: The digital angle ruler is made of stainless steel, and the laser etching measurement provides clear readings. The digital LCD screen is easy to read, avoid guessing, and can be used for a long time. Unique design: The combination of ruler and protractor can measure length and angle for easy measurement. Easy to use: the reset button can be zeroed at any angle for relative measurement. Keep the button, you can keep the angle at any time without worrying about data deviation. Automatic shutdown: 3V CR2032 battery included. It will automatically shut down after 10 minutes of inactivity,You can measure the angle of 360 (i.e. internal angle, external angle) while you also measure the length. Multifunctional measurement: Combine stainless steel ruler and angle sensor to measure angle and length. Ideal for internal and external measurements. Stainless Steel Digital Inclinometer Protractor Specification: Material: stainless steel Length: 200 mm / 8" Working range: 0-360 Size: as shown Quantity: 1 piece*digital angle ruler