Just a footnote to point out that a safer and less fiddly approach is to add two 10 ohm resistors to the supply rails, and measure the voltage drop.
Or if the board already has 10 ohm resistors on the way in, measure the voltage drop there.
(resistors are a lot cheaper than the fuses in your multimeter)
I think @analogoutput has a utility PCB that does that, but cannot find the link right now.
EDIT: It’s linked from the post @KevinG linked to above: Power Consumption Specs of all Modules? - #3 by Dud