So a few months ago, I stumbled upon a thing at Adafruit.com called a "Charger Doctor" which was really just a Multimeter designed to slip inline with your USB cable. It was $7.50 and I liked it.
With a list price of just $339, the Model 2831E benchmultimeter from B&K Precision not only offers value, but also true-RMSmeasurements for applications in service and repair, manufacturing, ...
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