Question about Joy-it USB multimeter

You can use the USB multimeter to determine which voltages and currents can be "negotiated" with your USB connection. However, it is only possible to determine whether the connection actually delivers these values under load. However, the USB multimeter cannot load the connection itself; this must be done by the connected device. If you insert the multimeter between your USB port and the connected device (the consumer), you can measure the voltage applied and the current flowing. Important: The USB-C adapter cable required between the source and the USB multimeter should be a cable with E-brand so that it can also withstand the higher USB-PD variants (20V / 5A). L.G.

Only if you use the USB-C port at full performance. Otherwise it just shows the current performance