http://www.amazon.com/Extech-CT20-Remote-Continuity-Tester/dp/B000LYTTRK/ref=wl_it_dp_o_pC_S_nC?ie=UTF8&colid=2FLJ9DJX48Y6G&coliid=I278JTTNNU3N70

Clip the little LED probe to the pins of the XLR in the pit, take the box to your both and start testing.