Innovative Products Of America IPA 9004A Smart MUTT Trailer Tester (7 Spade Pin Style with Adapter) Advanced diagnostics, wireless remote Lightweight and portable solution for assessing trailer wiring and works on 4/5, 6 round, and 7 flat trailer connections Identifies power pulse, cross, open, overloaded and shorted circuits Amperage readout; audible and visible alerts Made in the USA