New Sierra Fault Finder, Part # 18-9904, for 6 to 42 VDC systems. For use in tracking and tracing current leaks, broken wires, short and open circuits without the need of wire piercing. Set comes in a hard, padded storage case that includes a users manual, a cordless circuit tester, 3 fuse block adapters (mini, ATO, maxi), transmitter and receiver.