Heart rate calculator?

To the HIIT pro's here, what do you guys use to check your heart rate when doing HIIT when your not on a treadmill, just outside doing it. Is it necessary to know your max. heart rate? Could it be effective if I sprinted as fast as I could till I could go no more, then do my 2-3 min light jog then sprint again?
 
Calculating your Max Heart Rate

I had the same question a little ways back. I wanted to know my max heart rate too and I didn;t want some phony generator on the internet. I was looking at blogs and I found builtlean.com. It has this great article called How to calculate your max heart rate. It really helped me and it will tell you what you want to know. While you are there you should check out the other articles, they are very helpful as well. They are written by this guy, Marc Perry, who is a personal trainer and a fitness expert. Hope it helps!
 
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