80V/35A PV Module Tester for Voc/Isc, Open Circuit Voltage & Short Circuit Current, with Backlight & Data Hold
This works great for checking panel performance and checking all the panel specs in different exposure conditions. If you are purchasing used panels, this tool is 100% worth it.
If you want to test strings of panels up to 2000W, use this version:
https://link.amazon/B0bKVGrXS