Sports Clock/Timer

[chiangrai]

I'm trying to find a clock for exercising.

What I want is a clock that will go off every 3 minutes so I know it's time to change to another exercise.

Do you know what I mean.It's not a timer and it's not an alarm clock,in fact I don't know what it's called so I can't find it online.

I know they exist because I saw one once but when I try to search for them I get

results for lap timers.

So does anybody know what that function is called.If you know where I can buy one online that would be great too.

The one I saw was a large electronic clock with a Lap Timer and Alarm but with this extra function to be able to set it to go off every few minutes.

Thanks