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.
Tests RJ11 and RJ45.
Tests of double-twisted cables: switch on the power (S is slow automatic grade, M is manual range). Put cables into both main tester and remote tester, the lights of the main tester will turn on sequent from 1 to G.