Portable RV Smart Surge Protector - 30 Amp SSP-30XProduct Description: Progressive Industries Smart Surge Protectors (SSP) MFG# SSP 30X are portable RV surge protectors with the added benefit of a built in polarity tester. The built in surge indicator notes the condition of the surge protector. Additionally, the polarity tester (dual line for 50 Amp) checks the status of the power source prior to use. Sleek, compact, portable design makes this unit easy to use and store. Designed for outdoor use. No