Features Indicates pair integrity of the cable, measure the length of cable/pair with or without far-end recognizer Locates wiring or connection error Measure cable length and determines the distance of open circuit and short circuit Permits you to check wiring error in 5E/6E twisted cord network, coaxial cable and telephone lines Applicable for open circuit, short circuit, jumper wire, reverse connection or cross-talk interference Dynamically calibrate cable length and takes cable length measurements. (97% Accuracy) LCD screen to display clear test results Long battery life (wait-case or standby mode for over 50 hours) Auto time delay shut off Comes with 1 far-end passive test jack Far end recognizer with prompt voice Single board computer software watchdog design for reliable operating Self-checking function that automatically compensates any change in battery capacity or ambient temperature