Just clamp your current probe over the loop to access the amperage draw through a fused circuit.; Easy testing access, plugs right into fuse socket, no more hand made adapters.; Testing range 0-30 Amps - Do Not Exceed 30 Amps; Can be used to diagnose a variety of amperage draw problems including: Fuel Pumps; Battery Drains; Blower Motors Shorts; Also handy for installers needing to monitor circuit amperage limits.