PeaceFair PZEM-021 AC Power Meter, Unboxing

Let's have a look at this 20A AC panel meter and compare it to the 100A model I looked at last year.
This is the PeaceFair model PZEM-021. It's rated for the same 80-260V (50/60 Hz) as the earlier model, but this one uses an internal current shunt (0.1 ohms) instead of an external current transformer like the PZEM-061 model. It has a 20A maximum current rating instead of 100A like the CT model.
I decided I wanted to try and use this model on my isolated variable voltage power supply, since that only goes up to 7 amps. My thinking is the 20A meter will be more accurate at the lower power and current readings than the 100A model.
eBay link, approx. US$15:
www.ebay.com/it...
I'll take a closer look inside this meter and make a modification to make it work better on the power supply. In addition, I have some ideas for using the two 100A meters I have, so stay tuned for those videos...
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