Negative symbolHigh voltage symbolAC Indicator for AC voltage or currentMR Indicator for recall the stored readingHz Frequency symbolMEM Indicator for data storeFUL Indicator for data stored is fullData hold is active4. SpecificationsAC Voltage (True RMS)Range Resolution AccuracyAllowable Maximumoverload protectionvoltageInputImpedance Frequency Range100V0.1V ±(1.2%+5) 750 RMS 10M 50Hz~200Hz400V750VFrequencyRange Resolution Accuracy