Precise Measurement - Range: 4x90° - Accuracy: +/- 0.1° - Operating Humidity: 85% - Operating Temperature: 0°C to 50°C. Lightweight and Portable - Compact and lightweight, made of aluminum alloy and ABS. This magnetic miter saw is easy to carry. Powerful Magnet Base - Securely attaches to saw tables, fences, blades, and other metal surfaces. Reversible display when flipped. Wide Range of Applications - This digital angle finder is suitable for auto repair, machine building, measuring tables or miter saw blade levers, construction engineering, as well as industrial construction, woodworking, machinery, telecommunications, and automobiles, etc. Energy-Saving - Powered by a single AAA battery (not included), this energy-efficient gauge can operate for over 50 hours. Features: 1. Small and lightweight, easy to carry. 2. Powerful magnets built into the base ensure secure attachment to any ferrous surface. 3. Large backlit digital LCD display. 4. Fast and accurate measurements. 5. Automatic shut-off after 5 minutes of inactivity. Main Functions: ON/OFF: 1. Press the ON/OFF button once to turn the unit on. Press and hold the power button for 3 seconds to turn the unit off. 2. After approximately 5 minutes of no movement or button presses, the unit will turn off. Press the power button once to restart the unit. ZERO: 1. With the unit powered 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 from the LCD screen. 3. In relative measurement mode, the operator can measure the difference between two objects. The 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.