The Triplett ET200 Combines a GFCI Tester and AC Line Splitter in one tool so that you can check outlet wiring, measure voltage, and use your clamp meter to measure current up to 15A. When measuring current you can without breaking the circuit. Clamp around the X1 position for a direct current reading or use the X10 position to display low current readings multiplied by 10. You can also detect faulty wiring in 3-wire receptacles. The lights display 5 wiring faults: Open Ground, Open Neutral, Hot/Ground Reverse, Open Hot, Hot/Neutral Reverse. There is an easy to read fault label on both sides for receptacles with ground up or ground down installation. At the push of a button, you can test GFCI for proper operation. Two very useful and necessary tool for residential and commercial electricians, home inspectors, and do-it-yourselfers. cETLus Listed.