DXL360S Dual Axis Digital Angle Protractor with 5 Side Magnetic Base High-precision Dual-axis Digital Display Level Gauge 100-240V 50-60Hz unit could be charged by connecting USB cable to unit and a computer’s USB port. Single and dual , convenient to measure angle. Dual and single with user friendly LCD display angle. High accuracy ��0.05��, high resolution 0.01��. Li-lon battery rechargeable, . With 5 Side Magnetic base, audible alarming at settable angle , any angle measurement. High resolution, professional measurement. V shape case for easy to fit at corner or pipe.Using this digital angle protractor, you can measure angle between two faces, not only in earth gravitydirection. Press Angle key at first face, and then rotate slowly and keep rotation to another testingface, It will then show angle once you not move unit. Any angle measurement is using gyro technique.Specifications:Accuracy:Resolution: 0.01��Item Weight: Approx 119.7g / 4.2ozUser Interface: Mono-color LCD with backlightResponse Time: