Whirlwind SC48RJ Speaker, Data and XLR Cable Tester

The SC48RJ covers the three cable types that go wrong on a load-in: multiline speaker cable on NL4 and NL8, RJ45 data cable, and XLR. Rotating the central switch applies voltage to one conductor at a time.

A SEND LED shows which pin is being driven and a RECEIVE LED shows where it comes back, so shorts, opens and cross-wires show up immediately rather than being inferred from a single fail light.