I got one free when I signed up to e-on about 18 months ago. Damn good bit of kit.
You were right first time - they measure current, not power consumption - and then multiply by a user entered voltage to give you an approximation of power.Good enough for most purposes though.I have one of these:Energy Saving Smart Meter - Efergy Elite: Amazon.co.uk: Electronics & PhotoDoes the job, and stores a few days/weeks/months of history.
Quote from: yostumpy on 07 November, 2009, 12:02:16 pmI got one free when I signed up to e-on about 18 months ago. Damn good bit of kit.Make sure you use their online energy tracker and enter readings every month - it is a really useful service, if you don't already that is.
I think the Efergy uses clips round the mains incomer, but don't quote me on that:-/