Check the listing for details. Mastech MS5908A RMS Circuit Analyzer Tester 110V RCD GFCI Socket Tester. Condition: New. Listed at 75.99 USD. Prdocut Description: This circuit analyzer is a special test device designed for AC low-voltage distribution line quick fault location. With simple operation, accurate measurement and other features, it can detect multiple problems on a line, such as causing to electric shock, electrical fire, abnormal operation of equipment, etc. Features: Display: LCD Overload: "OL" or ">" Low battery voltage:"" Time for auto power-off: Power off when the keys arent presses for 30 minutes. Humidity: 3.00Ω Neutral-Ground Voltage +-(2.5%+0.2) 0.0~10.0V RCD(GFCI) Trip Time +-(1.0%+0.2) 1~6.500ms RCD(GFCI) Trip Current +-(1.0%+0.2) 30mA(6mA) Line Frequency +-(1.0%+0.2) 45.0~65.0Hz % Voltage Drop +-(2.5%+0.2) 0.1~99.9% Voltage Drop Load Current unspecifed 12/15/20A Packing content: 1 X MS5908A Circuit Analyzer 1 X power plug (Optional) 1 X English Manual 1 X Carry Bag