Fitness tracker - with heart/oxygen recording - any recommendations?

[dowie]

I'm looking for a fitness tracker and could do with some recommendations - would like it to monitor/record heart rate and, if possible, oxygen levels too. Chest strap/non chest strap I'm not too fussed either way.

Ideally it ought to be waterproof too(as in able to go for a walk/run in the rain - not swimming).

 

[dowie]

I'd like to be able to use it outdoors too, ideally in rain as well. Doesn't have to have GPS though.

 

[dowie]

I've never heard of an oxygen level monitor beyond app gimmicks. With the lack of accuracy measuring your pulse, I can only guess that the oxygen saturation monitors for your skin are even worse.

I did wonder if that was possible - I think apple wanted their watch to be an all round fitness tracker with heart rate and oxygen monitoring etc... but it didn't work out quite as well as they'd hoped. Given the budget they have for hardware projects I guess others making those claims might be a bit dubious.