Different readings from same device

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Hi. I am using a Sonoff POWR3 to read my electricity usage and also a POWCT that reads the same electricity usage because they are both connected to the same Live wire. Why do they give different readout. The POWR3 gives a 700Watt lower reading than the POWCT. Which device is giving the correct readout? For the total amount usage for today the 1 says 1.98kWatt and the other 2.8kWatt

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