Ideal Industries E-Z Check Plus GFCI Circuit Testers Tests for correct wiring, open ground, reverse polarity, open hot, open neutral, hot on neutral, hot and ground reversed with open hot in 3 wire, 120 VAC circuits. Simulates ground fault for testing GFCI. No-slip ergonomic design maximizes comfort. Premium neon lamps prevent false readings. Tough, impact- case Pack of 1