360° Mini Digital Protractor Inclinometer Electronic Level Box Magnetic Base Angle Finder Measuring Tools Construction tools     Description:     1. Ultra-small size, portable design and simple operation     2. The measuring surface is magnetic and can be attached to the metal surface     3. High-precision resolution     4. With conversion slope and slope percentage     5. There are absolute and relative measurement modes     6. Large clear LCD display     7. Can measure data retention     8. Calibration button to calibrate the meter to any reference surface.          Specifications:     Measuring range: 4×90°     Resolution: 0.05°     Operating temperature: 0 to 40 degrees     Working humidity: 40～80% humidity     Power battery: 2×1.5V AAA battery (not included)     Size: about 58×57×24 mm     Product weight: 57G          Notice:          1. Do not clean with organic solvents, keep away from water and corrosive substances          2. Do not damage or wear the working surface, use a soft cloth to remove the dirt and maintain accuracy          3. If the instrument is not used for a long time, the battery should be removed for storage.          4. When the power supply voltage is too low, the battery symbol flashes, please replace the battery as soon as possible.          5. Because this product is only suitable for two-axis measurement, when the third axis (front and back) and the horizontal angle are less than 45°, the LCD displays the error message "error".