DMM = digital multimeter. Something to test voltage. Under $10 at Radio Shack or automotive stores or pretty much anywhere.
I am not sure what the best thing to put on the 5V would be. I have seen people use light bulbs for their case, but I dunno if I would want to keep them on all the time. It may not even be an issue with newer PSUs but it is something to look into. You may not even miss that 0.5-1V anyway.
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