1、Large capacity standby with automatic power‑off function , use CR2032 button battery to work for more than 2000 hours (battery not included). 2、Digital protractor is equipped with a large LCD display for easy reading, measuring range is 0~999.9°, accuracy is ±0.3°, resolution is 0.1° 3、2 in 1 digital protractor, digital stainless steel ruler and angle finder combo makes precise measurements. 4、It allows complete 360‑degree measurement of internal and reverse angles. The protractor combines standard and metric scale scales. Relative and absolute angle measurement. 5、The digital protractor angle gauge and angle finder durable stainless steel body can be used for a long time. With HOLD and RESET function, lasering engraving scale, clear and accurate, will not fall off. 6、Convenient locking screw, by pressing the screw, the ruler can be kept at any angle. For maintain its accuracy and read it easily, angle finder could be locked at any angle. 1 x Digital Protractor(Battery Not Included)1 x English Manual Item Type: Digital ProtractorMaterial: Stainless SteelColor: As shown in the pictureSize: Approx. 21.5x 3.5x2cm / 8.5x 1.4x 0.8in Weight: Approx.210g/ 7.4ozBattery: 210mAh CR2032 Button Battery (Not included)Measuring Range: 000.0- 999.9°Measurement Accuracy: 0.3°Resolution: 0.1°Application: Drawing/mechanical measuring instrument/indoor decoration measurementWorking Temperature: 0~50℃How to Use:Install the battery, turn it clockwise to tighten the moving ruler, and turn it counterclockwise to loosen the moving ruler. Put the tool on any surface, short press the ON/OFF button, and press the zero key to set it to 0.