I just got one of these; I love it and it seems accurate. But I would like to check its accuracy.
Can anyone think of an appliance with very predictable constant power consumption that I could use to test it?
If not, can anyone think of other ways to test it? I was thinking I could get a second one, and either test them side-by-side with similar appliances or plug one into the other and see how close they are. Or maybe I could hook it to a large appliance and compare the power use to the increase in power consumption on my main meter. Not sure....
Edit: h/t @Harper - Reinstate Monica maybe I can use this method: https://youtu.be/xCVnW_Ou470?t=107
Update: I tested my Kill-a-Watt with the following devices:
18W portable fan with single setting - Kill-a-Watt says 17.6 120V 8A portable drill, trigger all the way down running in the air - Kill-a-Watt says much less than 960 1500W electric kettle - Kill-a-Watt says 1487
The drill is the outlier. Based on the comments this seems normal for electric motors not encountering much resistance.