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dude, from the explanation you've quoted, it's is precisely measuring this: how many tomatoes you have eaten
it says it measures light re-emmited by carotenoid molecules at 510nm but i suspect that what it really measures is how red you are. at the best it's only reading approximately how much of one type of anti-oxidant you have.
but eating tomatoes is probably a good idea, however it was arrived at.
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