Feeler Gauges, Vernier Calipers -LCD Digital Protractor Inclinometer Highlights Generic LCD Digital Protractor Inclinometer High accuracy 0.1, high resolution 0.02, professional measure. The Li-lon battery is rechargeable and durable. Easy for data collection with the SVRS232 USB adapter. Single and double axis, convenient to measure the angle. Double and single axis with user-friendly LCD viewing angle. V-shaped holster easy to install at corner or pipe. With 5-sided magnetic base, beep alarming in the configurable angle range, any angle measurement. The unit can be charged by connecting the USB cable to the unit and the computer's USB port. specification: Plug type: US plug Accuracy: 0 to 20: (0.1) 20 to 70: (0.2) 70 to 90: (0.1) Single measurement range axis: 360, dual axis: 40 Resolution: 0.02 Response time: