02-16-2018, 12:00 AM
It's a typical problem. Nothing that is "inexpensive" will efficiently measure 1500 Watts and 1.5 Watts. A clip on Amp meter that will accurately and precisely measure 200 mW and up to 1500 Watts will be $50 and up.
(In)Accuracy of a Kill-A-Watt for measuring low power usage
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