With many HDMI cables, you can tell what they are by reading what's printed on them. For example, if you find the words HDMI ...

Would you like to check the data speeds and charging power of your cables and chargers or are you tired of dealing with unreliable USB-C to USB-C cables?

This small PCB tester checks every wire on the cable, including the shield, and both connector orientations. He also makes a version for testing USB A to C cables (see video below the break).