Hand-held LAN network connection tester for RJ11, RJ12 and RJ45 cables. Indicates connection errors, short circuits and open circuits. Standard and slow speed display modes. Includes master and remote units. Requires 1 x 9V (PP3) battery. Hand-held LAN network connection tester for RJ11, RJ12 and RJ45 cables. Indicates connection errors, short circuits and open circuits. Standard and slow speed display modes. Includes master and remote units. Requires 1 x 9V (PP3) battery.