Energy Meter (watt meter specifically)

Hi guys,
After a simple plug into the wall, devices plug into it energy meter so i can monitor how many watts im using.
Want to check both my mining rig, and my inverter in my car when i plug devices into it.
I noticed Jaycar has one for $20 here: http://www.jaycar.com.au/productView.asp?ID=MS6115
But it looks pretty cheap and nasty (I know its only $20..)
Anyone know any better ones?

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