This LAN cable tester measures the length of the cable and determines the distance of the open circuit and short circuit. It allows you to check the wiring error in the 5E/6E twisted pair network, coaxial cable and telephone line. Self-check function and automatically compensates for any change in battery capacity or ambient temperature. Characteristics Network Cable Tester -Color: as shown. -Material: plastic. -Size: 8.2x18x3.8 cm/3.23x7.09x1.50 inches. Suitable cable: double twisted STP/UTP cable, coaxial cable, telephone line; Tester port: -RJ45 master port tester (M), RJ45 port LOOPBACK tester (L), RJ45 port for long-end recognition (R) Double twisted cable length measurement: Range: calibration from 1 to 350 m (3 to 1200 feet) Calibration accuracy: 3% (0,5 m or 1,5 ft) (calibration cable > 5 m) Unit of measurement: display in meters (M) or feet (FT) Calibration of length: -The user can set the self-calibration factor for a given cable length. -Calibration cable length exceeds 5 M Wire order and cable location error: Check for errors such as broken circuit, short circuit, reverse connection, intersection or interference Location cable: 1 passive far end test socket included Automatic time: shutdown delay time; Tester is idle for 30 minutes Ambient temperature during operation: -10 ℃ to 60 ℃ Net Weight: 0,21 kg / 7,4 oz List of things to pack 1 * Network Cable Tester 1 * Far End Test Plug 1 * instruction manual;