Basetech bt 100 cable tester for rj 45 rj 11 basetech bt 100 p the basetech bt 100 is a cable tester for unshielded utp or shielded stp ftp rj 45 modular plug systems up to cat7 or rj 11 rj 12 modular plugs with 2 to 6 wires p p each wire of the connected cable is individually tested and the classification is shown on a clear luminous bar display the testing process runs automatically the classification of the wires or possible errors such as open circuit or short circuit can be