Why everyone needs this USB power meter I tested that's shockingly accurate (and it's cheap)

I never thought that a $12 accessory could rival tools that cost much more. But this USB-C power meter delivers in profound ways.
Business Wire

Advanced Energy’s New Power Meter Improves Accuracy and Performance in Precision RF Power Applications

DENVER, Colo.--(BUSINESS WIRE)--Advanced Energy (Nasdaq: AEIS) – a global leader in highly engineered, precision power conversion, measurement and control solutions – today announced the GEMINI™ 5540A ...