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I've used the Jaycar one from about 5-7years back, it's accuracy was questionable when below 30watts or so, therefore not great for standby.
I have confirmed it's accuracy against stated consumption values on some old heaters (700w/1400w), a pond pump (192w) and a air pump (80w) and my networking hardware with NAS (30-40w, in agreement with the front panel of my UPS.).
I'd be interested in standby, but I think our issue is too many fridges/freezers and pond pumps, these all go 24/7. Timers are going to be used but it's a bit tricky with bacteria in filters dying relatively fast if water isn't flowing over the media.
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