In Amperes (A). If you are using a pure resistive load like a bulb, this will be the ratio between the two previous values, i.e. power / voltage. You can also use a current clamp around one of the power wires to get this value.
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In Volts (V). Enter your the nominal AC voltage for your household or facility, or use multimeter to get this value.
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In Watts (W). Calibrate your sensor connecting a pure resistive load (like a bulb) and enter here the its nominal power or use a multimeter.
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Move this switch to ON and press "Save" to revert to factory calibration values.