Electrical levelling instrument is a portable tool which can measure the tilt angle quickly and accurately. Features: With 0.02° high accuracy, the digital protractor is designed for measure the tilt angle quickly and accurately. 2.4-inch digital color screen and 4 LED lights of the 4 corners for easy reading and use, clear and intuitive. Multiple-interface display: measurement, system config, angle control, free fall detection, shake detection, wave curve. Output control interfaces on both sides facilitate subsequent installation if necessary. 1200mAh rechargeable li-ion battery ensures strong endurance; quickly recharge it via the USB charging port. Built-in magnets ensure the digital protractor and measured object are close fitting. Mini size, lightweight and portable. Widely used in measurement, data collection and installation of mold development, sheet metal bending, machine tool, steel structure, scaffold, door and window, etc. Note: Size and color may be slightly different due to manual measurement and different light conditions. Thanks for understanding. Specifications: Color: Yellow Material: Plastic + Electronic Components + Magnet Display: 2.4" Color Screen Accuracy: 0.02° Measure Range: Single Axis 360°, Dual Axis ±60° Buzzer: Yes LED Indicator: Blue Power Consumption: 0.2W Built-in Battery: 3.7V 1200mAh Li-ion Battery Work Temperature: -10~40 Item Size: 83 * 83 * 30mm / 3.27 * 3.27 * 1.18in Item Weight: 155g / 5.44oz Package Size: 17 * 10 * 3.8cm / 6.69 * 3.94 * 1.50in Package Weight: 216g / 7.62oz Package List: 1 * Digital Protractor 1 * USB Cable 1 * User Manual (English)