The Extech CT70 GFCI and AC Circuit Analyzer features outlet load handling capabilities plus Outlet Tester functions. Circuit and wiring issues can introduce shock hazards (from grounding issues) and can compromise performance of machinery and equipment (from poor ground impedance, lack of sufficient voltage under load and/or high ground-to-neutral voltage). The CT70 is a GFCI and AC Circuit Analyzer which covers outlet load handling and outlet tester functions. Selectable loads of 12, 15 and 20 Amps. Calculates and displays % Voltage Drop and Line Impedance. Displays Peak Line Voltage and Frequency.