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❤❤Using this axis digital angle protractor, you can measure the angle between two faces, not only in earth gravity direction. Press Angle key at the first face, and then rotate slowly and must keep the rotation axis to another testing face, It will then show the angle once you not move the unit. ❤❤Features: V shape case for easy to fit at the corner or pipe. With 5 Side Magnetic base, audible alarming at settable angle range. The unit could be charged by connecting the USB cable to the unit and a computer's USB port.❤❤Specifications: Color: Yellow Accuracy: 0 to 20°: ± (0.1°) 20 to 70°: ± (0.2°) 70 to 90°: ± (0.1°) Measuring Range Single Axis: 360° , Dual Axis: ±40° Resolution: 0.02° Response time: