For a multimeter, the Plugable USB-C Amperage and Volt Tester (USBC-VAMETER) manages to fit a lot of useful features into a sturdy little package. About the size of a USB flash drive, this bidirectional USB tester allows for full USB data passthrough while it monitors USB-C power and charging, measures voltage and amperage, even visualizes the directional flow of electrical current–all in real time.

Connect the USB voltage tester inline between a USB-C host system like a laptop, tablet, or cell phone and a charger to use it as a USB voltage meter or power consumption meter. An updated OLED digital screen means a brighter and easier-to-read display in any lighting conditions, and a new orientation button lets you flip the screen with a click.

How it works:
This mutli-meter is a transparent interposer–it should not interfere with the USB data (1.1 through 3.1 Gen 2), USB-C Alternate Mode video, or USB-C charging. The USB-C tester can be used inline with USB-C docking stations, chargers, and other USB-C accessories. The usb amp meter is able to achieve this without interfering with normal USB-C operation as it only taps into the power (VBUS) and ground connections to measure values and leaves the data lines untouched.

Common uses
-Connecting between a USB-C host system like a laptop, tablet, or cell phone and a charger to monitor charge information.
-Connecting between a USB-C host and docking station to monitor charge information.
-Connecting between a USB-C host system and a USB-C bus powered accessory like an external hard drive, flash drive, etc to measure power draw of a device.
-Testing for USB-C port spec compliance such as a VBUS hot condition, voltage drop under load, etc. This meter is not meant to replace professional USB-C testing equipment, it is designed for quick and easy measurements for users at any skill level.