Newegg has the new P3 International P4460 Kill A Watt Electricity Usage Detector for $30 - $5 off with coupon code EMCKGKF34 [Exp 3/10] = $25 with free shipping. It improves upon the original P4400 by providing direct energy cost calculations so that you can see how much your plug-in gadgets cost to leave on.
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I remember the meritline.com constantly on sale for $17 shipped...
That's a different model. This one is a slight upgrade.
swell. a plug-in gadget that tells you how much electricity your other plug-in gadgets use. how did I ever live without this?
The one useful application I have found for these (since high powered devices like a refrigerator have energy star ratings already and everything else I can ballpark guess close enough to know if it matters) is testing how effective changes are on computer systems.
Overclocking/overvolting, underclocking, power management and downthrottling modes, etc, can be determined to work effectively or not. In some cases (especially Athlon Thunderbird or XP era systems) the motherboard manufacturers disabled HALT state for the CPU in the chipset bios registers so the systems would sit there at 90% peak power utilization when idle which was quite a waste... and tends to wear out motherboards and PSUs faster too.
I'm still waiting for the one that will save the readings for download to a spreadsheet so I can see what is happening. (Or wifi the readings).
#4 - don't trust those energy star ratings for actual use: they're good for between-appliance comparison but not to estimate actual usage.
For example, the refrigerators are tested by being kept in a constant 90F room, door not opened and closed, and a particular amount of thermal mass (water in jars, I think) kept inside.
Does that match your actual usage?
I put a kaw (the earlier model) on a new fridge, and was pleasantly surprised at how much better than it's yellow sticker numbers it was doing, got interested in why...
Which is all that matters. I can't very well compare my frige to anything else if I need a frige.
For example, the refrigerators are tested by being kept in a constant 90F room, door not opened and closed, and a particular amount of thermal mass (water in jars, I think) kept inside.
Does that match your actual usage?
It might as well, /I don't care/ I'm happy to pay for refrigeration.
I put a kaw (the earlier model) on a new fridge, and was pleasantly surprised at how much better than it's yellow sticker numbers it was doing, got interested in why...
I never will. Efficiency depends mostly on design and usage, both of which can be chosen without nailing it down to the last watt.