Kupo 19-pin cable tester is a handy gadget for quick cable checking. It is made of classic PLS connector so t can be used to check any 19-pin extension cable built up with major brands of Soca connectors. Plug it up with cable set and it will check out the circuit status immediately. There builds up a rotary switch with 6 LEDs in female connector to indicate the status of each channel; select by channel to identify the wiring status on each channel. Red LED will light up if there is any wrong wiring.