Cheap Thoughts: Kitchen timers

Why don’t kitchen timers count up as well as down? Isn’t that a valid use of a timer? What if I’m eyeballing something on the stove and I just want to know how long it’s been cooking. My only choice is to set the timer to some random time and do the math to figure out the time.

I would think it’d be a simple thing to make timers that count both ways. Maybe it’s just me.