How do you know when a baked potato is done? When baking a baked potato in the oven how do you know when it's perfectly done?

Squeezing it doesn't seem to be that accurate for me.  And using a fork seems pretty arbitrary.  Any better ways?
If you want to go all engineer on your unsuspecting spuds, take their temperature with an instant read thermometer. According to several online sources I found, the ideal internal temp for your 'tater is 210F (99°C).