The Camco Power Grip RV 30-Amp Circuit Analyzer with Integrated Surge Protection and Fault Indication helps protect your RV from power surges and faulty electrical connections. Diagnostic LEDs indicate faults when you connect your electrical cord to the power pedestal. The circuit analyzer indicates faults for reverse polarity, open neutral, and other wiring issues. Includes integrated surge protection of up to 1, 050 Joules. 30-amp male (NEMA TT-30P) / 30-amp female (NEMA TT-30R). Does not protect against sustained high or low voltages. Patent pending. Circuit analyzer indicates fault for reverse polarity, open neutral, & more Integrated surge protection of up to 1, 050 Joules 30-amp male (NEMA TT-30P) / 30-amp female (NEMA TT-30R) | Camco 55311 Power Grip RV 30A Circuit Analyzer