The IDEAL 61 051 E Z Check Plus Circuit Tester has a no slip ergonomic design that maximizes comfort. The premium neon lamps prevents readings and it has a tough, impact resistant case. It Tests for correct wiring, open ground, reverse polarity open hot, open neutral, hot on neutral, hot and ground reversed with open hot and ground fault interruption in 3 wire 125 Volt AC circuits. It also tests GFI receptacles for proper operation and has a 2 year warranty. In 1916, J. Walter Becker started the Ideal Commutator Dresser Company of Chicago from his mother s kitchen. He manufactured commutator dresser stones with the belief that every product should be worth more than the price paid for it. Service, he said, was part of the product. That idea has been the core IDEAL business principle for over 90 years. Today, the many loyal distributors and customers that make IDEAL successful are a testament to Becker s original philosophy.