Solar Panel Multimeter - Or how else to check you panels

I have now ordered a Solar Panel Multimeter and Tester. I tried different other test methods but non were really working or reliable. I hope this tester gives us the consistent result for all of our used panels.
I also go quickly over some other tests I did and how everyone can check panels at home.

Solar Panel Multimeter, Electronic Load, Capacity Tester, Watt Meter, Internal Resistance Tester
https://off-grid-garage.com/measurement-tools-and-analisers/

Check out Timo's channel (in German), as he gave me the tip with the tester:
https://www.youtube.com/channel/UCScVcJIaq-2C9CPDyjqEpoQ

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