We use timers all over our shop to keep track of pot life on epoxy, paste work time, etc. The timers we use are from "Big Clock" or someone like that. They cost about $10. They keep time, count time up [run time] and count down from a set time. [As you can imagine, every troop has a couple of these timers at home to keep track of hard boiled egg cook time, timeouts, and whatnot.] These units are, maybe: 3" by 2+" and have a gray and black display that's maybe 2.5" by 1".
We don't need all of that. Can anyone give us a source for a $1 count-down timer [clock]?