Digital Torpedo Level Protractor Magnetic 4x90°Measuring Range Electronic Angle Grader Inclinometer Electronic Level with Magnets Incline Test Ruler Features: Functions: Absolute angle measurement, relative angle measurement, upright display, sound reminder. Stainless steel sheet-Measuring faces, Securely attaches gauge to any metal surface. LCD display - Large and backlight, easy to read digits! When the angle is equal to 0 degrees or 90 degrees, an audible reminder will sound. The displayed value would not be upside down whatever the unit is upside down or not. With a good neodymium magnetic base attraction, make your work more worry-free. Automatic shut off after continual non-use, so it does not waste battery power. Wide Application：mechanical engineering, building works, communications installation, etc.    Note: 1. Don't clean this precision device with an organic solvent. Keep it away from water and corrosive.           2. Don't hurt the unit's working surface. Get rid of any dirt on it with soft cloth in order to keep its accuracy.   Specifications: Color: Blue Yellow Red (optional) Material: Stainless Steel  Precision: 0.1° at 0° and 90°+0.2°at other angles  Measuring Range: 4x90°  Resolution: 0.0 5°  Battery Type: 1.5V AAAx2 (not included in packaging) Working Temperature: 0°C-40°C  Relative Humidity: 40%-80% Package Weight: 200g Package Size: 29.2 * 6.3 * 2.4cm   Package List: 1 * Level Protractor 1 * Instruction Manual