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That meter is a multimeter. It shows more than volts.
LCD's can use as much as a CRT!!! Some LCD's use almost 200watts. Look for led lcd's that use no more than 30 watts active.
I monitor my energy use. Most of the older wall warts use 3 watts all the time. If you have ten in your home that is 30 watts all the time. Like putting a 700 watt bulb on for an hour each day. Who would do that?
Put every item in your system on a power strip. When you are not at the computer turn it all off and use the power strip switch. Power strips also help prevent voltage spikes and in some cases lightning. Edited 2011-08-03 16:17 UTC