On 19/08/2018 10:58, Andrew Gabriel wrote:

Clip-on power meters have been available for many years which do
this (albeit less accurately), and their impact was identical, so
it comes as no surprise.

+1
I've had a clip on meter for many years. The novelty wore off after
around a week. The only time I now look at it is before leaving the
house for an extended time (holiday etc.) just to see that I haven't
accidentally left something on such as the immersion heater.



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