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Sonoff POW R2 Volt-Ampere-Watt calibrate

I measured with different multimeters.

my 2 Sonoff POW R2 and my Sonoff Pow

vary a bit, the pow by 1 w difference

the Sonoff Pow R2 at AC voltage is 2 volts less than actual. 

Watts and amps also give way and show a difference.

it would be good if you could adjust the values yourself!

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