Waterproof LCD Inclinometer for Magnetic Digital Angle Protractor with Built-in Magnets RedAccurate measurement - Range: 4 x 90 - Accuracy: +/- 0.1 - Operating humidity: 85% - Operating temperature: 0 C to 50 C. Easy to carry - Compact and lightweight, made of aluminum alloy and ABS. This magnetic miter tube is compact and lightweight. Powerful magnetic base - Attaches to saw tables, fences, blades and other metal surfaces - Display reversible if inverted. Wide range of applications - This digital angle measuring device can be used for automobile repair, machine building, measuring table or miter blade levers, construction engineering as well as for 'construction, wood, machinery, telecommunications and automobile industry, etc.< /li> Energy Saving - With one AAA battery (not included), this energy saving fill gauge can work more than 50 hours. Feature: 1. Small and light, it is easy to carry. 2. Built-in strong magnets on the base that ensure attachment to any iron surface. 3. Large digital LCD screen with backlight. 4. Fast and accurate measurements. 5. Automatic shutdown after 5 minutes without operation. Key Function: ON/OFF: 1. Press the on/off button once to turn on the device. Long press the power button for 3 seconds to turn off the device. 2. After approximately 5 minutes without movement or pressure, the device will turn off. Press the power button once to restart the device. ZERO: 1. When the device is turned on, press the zero button to set the display to zero and enter relative measurement mode. 2. In relative measurement mode, the ABS symbol disappears on the LCD screen. 3. In relative measurement mode, the operator can measure the difference between two objects. Absolute mode measures the angle between the horizontal level and the first object. 4. To return to absolute measurement mode, press the on/off button once.