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Great post, thanks for taking the time to write up your findings. I own a Flex and a Zip. I've notice the same discrepancies between the two. You said earlier on in your review that you "calibrated" both devices, how exactly did you do that. As far as I can tell there is no way to calibrate the Flex unless I am missing it.…
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I'm a huge tea drinker too (British born) and always count my tea consumption as part of my daily water intake. Think about it, say you drink 5 cups of tea a day, do you really still need to drink 8 cups of water? Nope, just three more of 'fluids' to be good. What others have said about caffeine is also true however, so be…