Heart rate monitor's, which one should I buy:?

Hey guys,

I am thinking about getting a heart rate monitor to be able to more accuratly measure how much I am burning. But I'm a little unsure about which one to get and how they work.For example; can I wear it all day long, or should I just wear it during excersise?

Any help would be appreciated!

I'm especially looking for brands that are available in NZ!

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