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Steam Deck is based on Arch Linux & folks are trying to get as close as possible on their other PCs I assume.

Open it up!

They put a regular old switch inside a fancy box, but you’ll be able to read the part number once you see the actual switch.

Unless you’ve managed to get a switch made out of superconducting material and you’re working inside a liquid helium bath, everything has resistance :)

You’ll have a bad time trying to measure such low resistances, so usually you can look at the datasheet for the switch you’re using or for a similar switch if you need a ballpark number. You’ll see an on-resistance, and a max current (since there will be arcing when you open the switch).

If you do want to measure the low resistance, you’ll need dedicated meter with a kelvin connection.