The Ideal 61-164 SureTest Circuit Analyzer is a True-RMS tester that measures line voltage, peak voltage, frequency, ground to neutral voltage, ground impedance plus hot and neutral conductor impedances. This Receptacle Tester identifies proper wiring in three-wire receptacles and identifies false (bootleg) grounds. Use it to test GFCIs and EPDs for proper operation. The Ideal 61-164 conducts testing without disturbing sensitive loads. Click the SPECIFICATIONS tab for complete technical specs