30 Second Economy Timer
The sands of time are upon you. These economical sand timers are great for game design, decision making in RPG games and all kinds of educational activities. You should be warned that there are a variety of things like humidity and such that can slow or speed the sand. These sandtimers are close, but not perfect. If you want an exact measure of time you should probably get a stopwatch.
3 1/2 inches