Feature: 1. Neodymium Magnetic base, has a very good magnetic attraction on the measured workpiece, making your work more worry-free. 2. Precision machined with 2 measurement modes conversion: absolute angle measurement and relative angle measurement and two vials (90 and 0 degrees). 3. Degree/percentage of slope conversion. 4. Automatic shut off after continual non-use, so it does not waste battery power. 5. LED display can be flipped automatically. Specification: Features: Neodymium Magnetic base, has a very good magnetic attraction on the measured workpiece, making your work more worry-free. Precision machined with 2 measurement modes conversion: absolute angle measurement and relative angle measurement and two vials (90 and 0 degrees). Degree/percentage of slope conversion. Holding measured display values, easy to read. LED display can be flipped automatically. Automatic shut off after continual non-use, so it does not waste battery power. Portable size, easy to use with other measuring tools, expanding the measuring range. Application：wood processing； vehicle repairing; machining Note: There is about deviation of 0.05°. Measurement value keeps changing due to the slight vibration. The measurement value will disappear if the measuring position changed after measurement. Specifications: Materials: ABS Color: Black Measuring Range: 4 * 90° 2 * 180° Resolution: 0.05°0.05°（<100°），0.1°（100°-180°） Package Size: 13 * 4.5 * 2.5cm Package Weight: 72g Battery Type: 1.5V AAAx2 Working Temperature: 0°C-40°C Relative Humidity: 40%-80% Package List: 1 * Protractor 1 * Operation Instruction Package List: 1 * Protractor 1 * Operation Instruction