This tester and tool bag set includes a Circuit Breaker Finder (Cat. No. ET310) and 2 Zipper Tool Bags. The Klein Tools ET310 Circuit Breaker Finder with Integrated GFCI Outlet Tester is a digital circuit breaker finder used to locate the correct circuit breaker in a panel to which an electrical outlet or fixture is connected. The Transmitter is connected to the electrical outlet or fixture in the circuit while the receiver is used to scan the breakers in the circuit panel. The Transmitter also features a GFCI outlet tester. Klein Tools' Stand-Up Zipper Bags will keep your pieces and parts organized. The body of this tough pair is made of coated 1680d ballistic material while the bottoms are reinforced with 2520d ballistic material. The gusseting on these bags keeps them standing up making it easy to find your hex keys, small levels, drill bits, and pieces.