#ToolOfTheDay USB ammeters (especially for USB type C) are super handy, but a number of models ONLY work when USB power delivery protocol is being used (so they appear to be broken when only plugged in at one end, when plugged into a charge-only cable, or prior to completing PD negotiation). This¹ ² one is not so cheap as many but works with all kinds of power sources.

¹ Affiliate link that will earn me $1.15 https://s.click.aliexpress.com/e/_c4C6aJQF
² Direct link for ad-blocker users https://www.aliexpress.com/item/1005008653105296.html

(attn @voltagex)