The cable tester can test correspondingly double-twisted
cables 1,2,3,4,5,6,7,8 and G, meanwhile, can judge wrong connection,
short circuit and open circuit.
It can test RJ11, RJ45, Test of double-twisted
cables: switch on the power, (S is slow automatic grade)
Put cables into both main tester and remote tester, The lights of
the main tester will turn to sequently from 1 to G.