This Powerpole tester plugs into any Anderson 15/30/45 Powerpole connector. The built-in LED will show green if everything is ok and red color if you have a reverse polarity condition. Use this simple tool to check your Anderson Powerpole connections. Powerpole® is a registered trademark of Anderson Power Products, Inc. Additional Model #'s 78-TESTBUDDY TESTBUDDY UPC: 840128904299