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> Build your own ph meter, Got this from a Ted talk by Massimo Banzi
post Jul 4 2012, 04:42 AM
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This is sweet. I wonder what the price comparison is.

The site say this is more expensive. Still check out the Ted talk on their app or web site.

This post has been edited by Thorhale: Jul 4 2012, 05:09 AM
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