2 in 1Ruler and protractor combo for easy measuring. Use as a digital protractor and protractor simultaneously to measure any shop angle. Digital angle gauges laser engrave metric and imperial dimensions on the edge of the ruler and feature precise digital readouts for measuring angles and lengths, ideal for woodworking, construction or drafting. High AccuracyThe accuracy of this digital angle ruler is 0.5 degree. Measuring range: 0-360/0.00-999.9. Folded length: 11/300mm. Total length 600mm. Its a great choice for most projects and everyday use, home DIY projects, woodworking, decorating and machining. Lightweight and durable, LCD displayThickened nylon glass digital bevel angle gauge, large size, high strength nylon fiberglass material, good rigidity, wear resistance, no deformation. When measuring angles, the Protractor features a large, easy-to-read LCD display so you never have to look and guess angles and lengths again. 360 Degree InversionThe digital protractor has an inversion function. Position the goniometer where you need to measure the next cut, lock it in place with a knurled lock nut, mark and cut with a miter saw. The monitor has a hold function that freezes movement for greater accuracy. You can save a lot of time and effort. ;Power supplyPower supply by CR2032 3V lithium battery, large capacity standby and auto-off function, can work for more than 2000 hours, save energy and extend battery life.