Floureon Axis Level Box Inclinometer Dual Axis Digital Angle Protractor with 5 Side Magnetic Base (DXL360) DXL360: High accuracy &plusmn;0.1, high resolution 0.02 Dual and Single axis with user friendly LCD display angle V Shape metal case for easy to fit at the corner or pipe 5 Side Magnetic base, Audible alarming at settable angle range, any angle measurement The unit could be charged by connecting the USB cable to the unit and a computer's USB port