Multi-purpose darkroom process timer which can be used as a three-stage timer- clock or stopwatch. Three countdown stages can be run simultaneously- or as separately switched timers. An audible signal is given at the end of the preset time so that you don't have to watch the clock while pouring solutions.

Times can be set in 1 second increments up to 19 hours- 59 minutes and 59 seconds.

Counts down to the alarm and then back up again.

Also functions as clock and stopwatch (to 1/100th second).