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Features: 1. Ultra-small size, portable design and simple operation 2. The measuring mask is magnetic and can be attached to the metal surface. 3. High Precision Resolution 4. Conversion gradient and percentage of gradient 5. Absolute and relative measurement modes 6. Large Definition LCD Display 7. Measurable data retention 8. Calibration button to calibrate meters to any reference surface. Specifications: Range of measurement: 4 x 90° Resolution: 0.05° Operating temperature: 0-40℃ Working humidity: 40-80% humidity Power Battery: 2 x 1.5V AAA Battery (not included) Dimensions: about 58 x 57 x 24 mm/2.28 x 2.24 x 0.94" Be careful: 1. Do not use organic solvent to clean, away from water and corrosive substances. 2. Do not damage or wear the working face. Use soft rags to remove dirt and maintain accuracy. 3. If the instrument is idle for a long time, the battery should be taken out for storage. 4. When the power supply voltage is too low, the battery symbol flickers. Please replace the battery as soon as possible. 5. Because the product is only suitable for two-axis measurement, when the third axis (around foot level) and the horizontal angle are less than 45 degrees, the LCD display error information is "wrong". Notes: 1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! 2. Please allow slight measuring deviation due to manual measurement. Included: 1 X Protractor 1 X User Manual