I have to purchase a good basic "Voltmeter" or whatever you call the item that measures resistance, volts etc. The fact that I'm not sure what it's called shows my level of experience here. Anyway, what should I be looking for specifically? Do I need to make sure the item measures things in certain ranges or has a certain level of sensitivity?

Can I get a decent one from Sears or Radio Shack? I know Home Depot have several for sale but I don't know exactly what I'm looking for. They seem to range from $20-$200 or more

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Thanks,
Ron Brooks