Heart rate monitors/calorie burners

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I'd really love to buy something that would actually count how many calories I'm burning so I can accurately count my exercise etc.

I live in UK so it would have to be something available over here, I don't want to spend mega pounds.

Do the wrist band ones do the same thing as I'd rather not have one I have to strap round my chest etc and can you get waterproof ones as I do go swimming quite a bit.

I don't even know where to start looking!

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