Electricity Standards

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Calibrated Device (1) Single-Phase AC Watt Converter Standard)
(2) Single-Phase AC Watthour Converter Standard)
(3) Single-Phase AC Wattmeter) 
Range 1 A/5 A,120 V/240 V,50 Hz/60 Hz
PF=0.0 Lead/Lag, 0.5 Lead/Lag, 1.0 
Uncertainty 45 μW(h)/VA(h) 
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