... : ≤ 2% (Resistor Load); Efficiency: ≥ 85%• Output Instruments: Frequency Indicator, 4-digits RMS digital frequency indicator, resolution 0.1Hz Voltage Meter, 4-digits RMS ... .1V Ampere Meter, 4-digist RMS digital ampere meter, resolution 1Ma Power Indicator, 4-digits RMS digital power indicator, resolution 1W Power Factor Meter ...