This is a countdown timer - that turns into a stopwatch, once it reaches Zero! - a Down then Up Timer!
Mr Sandven emailed us the idea - because he wanted to see how late his students were coming back from break-time!
We hope some of you find a less nasty use for this timer. If you do - please let us know! :-)

Down Then Up Timer - Countdown Then Up Timer - Timer - Countdown - Stopwatch