Camco Dogbone RV Circuit Analyzer With Power Grip Handles, Integrated Surge Protection and Fault Indication (125/250V 50M/50F Amp) (55313) Helps protect your electrical equipment from improperly wired electrical boxes Diagnostic lights for visual indication of faults before you connect your RV's Power Cord to the electrical box Surge protection up to 4200 joules;Cutting-edge innovations, reliable design, solid value Power grip handle makes plugging and unplugging safer and easier Weather resistant