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 Applicationmechanical 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+0.2at other angles Measuring Range: 4x90 Resolution: 0.0 5 Battery Type: 1.5V AAAx2 (not included in packaging) Working Temperature: 0C-40C Relative Humidity: 40%-80% Package Weight: 200g Package Size: 29.2 * 6.3 * 2.4cm Package List: 1 * Level Protractor 1 * Instruction Manual