For testing my DC power supplies, I have ordered a unit that can simultaneously measure voltage and current on a load. The unit also calculates load power consumption.
I purchased the item off of Amazon.com for about $16. It comes with a 75mV per 100 watt current shut, so it can be used for loads of up to 10,000W. It's a 4 terminal measurement, one voltage measurement across the load, and one voltage measurement across the current shunt.
The unit is available from Amazon, Ebay, Aliexpress, under many different distributors, however, as far as I can tell the original manufacturer is Peacefair, in China, and the model number is PZEM-051
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