makes you can see the numbers more clearly, and easy to read data in dark spaces. With screen rotation function, the digital measurement reading will automatically invert for higher convenience. Magnetic Surface: The magnetic stainless steel measuring face makes it can easily and firmly attach to the surface of metal, easily free your hands. Multifunctional Design: The angle inclinometer support horizontal position calibration, absolute angle and relative angle measurement, support degree and slope percentage conversion, mm/m and in/ft units conversion, data hold, backlight on/off, automatic shutdown, and with 0/ 90 beep. Absolute Angle Measurement: It will display the angle between the measured surface and the level, When the angle betweenthe working surface of the unit and the level changes, the angle value changes accordingly. Relative angle Measurement: Put the unit's working surface on the surface you need to preset,press REF button, "0.00"is displayed.Then move the unit to other surface to be measured, the displayed value will be the included angle of the two surfaces. Wide Applications: Suitable for construction workers, decorating designers, maintenance workers, carpenter or other professional. It provides convenience in woodworking, construction, machinery, telecommunications, automobile etc. Specifications: Name: Digital Protractor Material: ABS + stainless steel Color: red, yellow, blue (optional) Battery: 2 * AAA battery (not included) Measuring ranges: 4*90 Working temperature: 0-40 Accuracy: 0.01 Resolution: 0.05 Electromagnetic protecting level: 3 level Item size: 286 * 59 * 20mm / 11.06 * 2.32 * 0.79in Package size: 292 * 63 * 24mm / 11.50 * 2.48 * 0.94in Package weight: 200g / 7.05ounce Packing List: 1 * Digital Protractor