ChargerLab's Power-Z KM003C USB-C meter.

USB testers have gone far beyond just testing the output voltages and power of ports, and can now test and check for counterfeit Apple chargers and cables.

I have dozens of different testers, but undoubtedly the most powerful isChargerLab's Power-Z KM003C USB-C meter .

Also: This is the ultimate iPhone car charger, and I just fixed its biggest problem

This can tell you anything and everything you need to know about a USB-C port, cable, or charger. 

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ChargerLab's Power-Z KM003C USB-C meter

A powerful USB-C tester that includes all the normal functions you'd expect of a USB-C meter (such as the ability to measure voltages and current), but also adds features such as Apple charger and cable testing

ChargerLab's Power-Z KM003C USB-C meter tech specs

• Size: 1.44 x 1.4 x 0.34 inches (36.5 x 35.5