This will tell you which types of “fast charging” Power Delivery a cable will handle and if the cable supports data, and will identify some types of electrical faults treedix.com/…/treedix-usb-cable-tester-usb-c-cabl… And this kind of thing will tell you how much power is actually being transferred (but nothing about data transfer) - as someone else mentions, this also depends on the device you’re charging/powering, and the power source, but it is a more immediately useful number than what specification is supported: www.aliexpress.us/item/3256807855183284.html?brow…