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Posted By: DamonHDIf you're trying to measure any non-resistive load (eg CFLs, and any newish electronics with a switch-mode or similar power supply) then such a clip-on meter may be badly off, up to 3x over-estimating in some cases (due to a device power factor of as low as 0.3).
I am told also that even less-obviously tricky appliances such as dishwasher and washing machine can give poor readings.
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