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@Dammit
That's what I got the Powercal for, and for averages it's really quite good- a bit low, but I could probably adjust for that as it's fairly consistant.
However I found that it gave me 2,300 watt spikes on a regular basis (when giving it the beans from a roll I suspect) which were 1,000 watts higher than I normally see for brief efforts, and was therefore slewing the figures.