... , 60Hz, adjustable between 45 and 70 Hz, 400Hz• Load Voltage Stabilization Rate: ≤ 0.5%• Frequency Stabilization Rate: 0. 1 ... resolution 0.1Hz Voltage Meter, 4-digits RMS digital voltage meter, resolution 0.1V Ampere Meter, 4-digist RMS digital ampere meter, resolution 1Ma ... resolution 1W Power Factor Meter Resolution 0.001• Protective Devices: Over load, short circuit, over voltage, over current, over ...