This RV adapter circuit analyzer are used to detect whether electrical piles in campground are wired wrong, ensure the safety of your electronics, surge protector up to 1050 joules, protect your RV from power surges. 30 Amp male to 30 Amp female adapter for you to convert the power at campground to fit for your 30 Amp RV, a easy power conversion, worry-free about the mismatching power at campground, more stable and safer wire connection. Plug circuit analyzer into the receptacle before plugging in the camper cord. The LED light illuminate to show power status, when the indicator light shows the wrong connection, it will remind you, avoid your RV from sustained permanent damage.