Features: Strong adsorption capacity: the working-levelis designed to strongly adsorb the magnetism, release both hands and easily record the reading, which is simple and convenient. 360 degree turnover measurement: when the instrument is placed upside down, the display screen will automatically flip to display 360 degree measurement. Four units: press the unit key on the working-level to switch four units, angle, slope, mm / m, in / ft. Data locking: the working-level can be locked at any angle, and the hold key can keep the measurement data at any angle. High precision double horizontal bubble: the working-level meter has vertical and horizontal horizontal bubbles, which is convenient to use. Specifications: Material: Plastic Measuring-range: 4*90 degree(100mm) Resolution: 0.1 Power supply: 3V button battery Measurement accuracy: 0.3 Relative humidity: 4% - 80% Size:10.00 * 4.20 * 1.60cm includes: 1 * Level