Mini Digital Protractor 360 degree Smart Tool LCD Digital Level electronic Inclinometer angle Digital Protractor Inclinometer Angle Meter 360? Slope Angle Upright Magnet Night vision Digital Angle Night vision Electronic Protractor Spirit Level Gauge Meter Tool Digital Meter Tool Inclinometer Angle Gauge Meter Protractor 360¡ã Magnets Base ,Night vision,Magnetic Base Product Description INSTRUCTIONS FOR Mini Digital LEVEL Functions 1. Absolute angle measurement Press ON/OFF to enter the state of absolute angle measurement. It will display the angle between the measured surface and the protractor surface. when the angle between the work surface and the surface of this digital protractor changes,the angle value changes accordingly. The indicating arrows on both sides appears,it shows the side is under the protractor. If the arrows aeProduct.getSubject()appears, and vice versa . The indicating arrows will disappear if it's on the level position. 2. Relative angle measurement Put this digital protractor on the surface to be measured,press (absolute/relative)button, 0.00¡ã is displayed. Then move the digital protractor to the second surface to be measured,the display value will be the included angle of the two measured surfaces. Press (absolute/relative)button for 3~5 minutes,it will change to the state of absolute measurement. 3. Upright display When the surface to be measured under the digital protractor,the display is upright. When the surface to be measured above the digital protractor,the display is upside down.(When the digital protractor is upside down,the display is not upside down. Attentions 1. Don't cleanse this precision device with organic solvent. Keep away from water and corrosive. 2. Don't hurt its working surface. Get rid of any dirt on it with sort cloth in order to keep its accuracy. 3. While using,it will shut down if its button is not pressed in 3 minutes in order to save power. When the power icon appears,it shows its power is used up and stops measuring. Replace with new 3V batteries of CR2032. Take out the batteries if it's not used for a long time in order to avoid the leakage of battery liquid. 4. Keep this device indoors in -30¡ãC~+65¡ãC and relative humidity <90%. TECHNICAL SPECIFICATIONS Measuring range:4x90¡ã Working temperature:0-40¡ãC Resolution:0.1¡ã Relative humidity:40%-80% Battery type:9V 6F22 Dimension:16*5.4*2.3cm One Set Included 1 x Mini Digital Inclinometer 1 x Instruction Manual