Identifies faulty park power plus offers surge protection. Also analyzes circuits to verify pedestal power. Indicators illuminate to show power status. Tests for and indicates: open ground, open neutral and correct polarity. 2800 Joules of power surge protection. Also, use 30/20 adapter to check 20 amp Circuit. Includes NEW rain-proof cover, Multi-Mode Surge Suppression, Automatic Reset On Power Restoration, 128 Second Reset Delay Protects A/C Compressor, LCD Display (English), Convenient Easy-T-Pull™ plug handles, Surge Protection Status LED Indicator.