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: Green  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