Durable ProtractorStainless steel digital angle, laser etched measurements provide clear reading. The digital LCD display is easy to read and takes the guesswork out High AccuracyThe accuracy of this angle finder is 0.3 degree. Measuring range: 0-360, folded length: 8 inch / 200mm, total length: 15 inch / 400mm Keep data and reverse measurement valueYou can save the data during measurement by pressing "HOLD / Rev."; The display can be reversed for easy reading by long pressing "HOLD/Rev." press Combination of 2 functions Combination of a ruler and a protractor You can measure lengths and angles for easy measurement Note The stainless steel edge is sharp. Be careful when using it and keep it out of reach of children Product Description Material: stainless steel + total length: 400mm + measuring range: 0~ 360 Resolution: 0.05 + Accuracy: 0.3 + Battery: 1 * CR2032 3V lithium battery (included) Package Content: 1 * AivaToba Digital Angle Finder + 1*User Manual Great locking feature: the tight/loose knob works well and you can adjust it to the tightness that suits your use < p>Zero button: simple and intuitive, using positive and negative angles Etched measurement: engraved measurement provides clear reading for life Length measurement Line and angle drawing External angle measurement Internal angle measurement