Simply plug your USB-C device and USB-C charging/data cable into either side of the Plugable USB-C Voltage and Amperage Meter. The meter is bi-directional so which side is used for input or output does not matter. If current is flowing, the meter's display should turn on and show the flow direction, amperage, voltage, and approximate charge rate in watts.
Please note that under normal circumstances the meter will not power on without a device connected (host, charger, accessory, etc) at both ends. If the meter turns on when only connected at one end, the attached device is "VBUS hot" which is against USB-C specifications.
On the side of the USBC-VAMETER there is a small button that can be pressed to rotate the screen 180 degrees which can be helpful for reading the screen depending on the orientation that the device is in.
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