This is a great and powerful USB power meter which is highly recommended. Make sure that you read and keep the manual handy since there are so many functions (and heed the warnings listed there). There are other cheaper versions/clones of this on Aliexpress which may also be good.
Another great gadget (no USB-C though) is "PortaPow Premium USB + DC Power Monitor/Multimeter/DC Ammeter" which is a neat little device - https://lygte-info.dk/review/USBmeter%20Portapow%20UK.html Checkout the reviews on Amazon too for further details.
I have this one, it was great for debugging an annoying transient during power-on which some combinations of hardware with caps on the edge of tolerance had! In the field too!
https://www.avhzy.com/html/product-detail/avhzy-c3-usb-c-3-1...
>PC suite for advanced online data logging, PD listening, online fast-charge trigger, and firmware upgrade.