It keeps track of all intervals. So if you are swimming say 300m and you want to count 50's then you'd hit the button to start and then hit it once each time you returned to your starting wall. If you are swiming say 50's with a rest interval, you'd hit it when you left, when you returned and then again after your rest when you started the next one (and so on).
I guess it kind of depends on if you want to use it to count laps or to record time. I use it for both because my pool has no clock. So say I'm swimming a 500m set. I'll hit the button every 100 to keep track of my count (every 50 would work too but I've gotten good at keeping track of 100's) and if I want to, I can glance at the time to get a pace estimate. If I want to time a 500, I hit it when I start and then not again until I'm done with the whole set and look at the time.
It does remember all the intervals (until you clear it), so you could just review all your numbers at the end and then add them up to get the times for different sets (like my 500 mentioned above), but that's a bit of a pain since you have to do it by hand.
I do like that once you star it, it runs continuously so that I know how long I've been in the water total (again, since my stupid pool has no clock). It's like a constantly moving clock - not like a stop watch - in this respect.
Am I making sense? It took me awhile to figure out all it's quirks and how I wanted to use it for my swim sets but now I love it.






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