Do the cable continuity check in a nice and easy way - Check wiring error in 5E 6E coaxial cable and telephone line - Applicable for open circuit short circuit jumper wire reverse connection or cross-talk interference - Find the location of wiring or connection error - Measure cable length and determine the distance of open circuit and short circuit - Dynamically calibrate cable length and make length measurement as accurate as 97% - Long battery life (standby mode for over 50 hours) - Auto time delay shut off - Measure length and pair with or without far-end recognizer - Locate cable and there is 8 far-end passive jacks (Only one jack is included in this auction) - Far end recognizer with prompt voice - Self checking function and auto compensate any change in battery capacity or ambient temperature - Powered by 4*AA batteries (not included)