Make a simple hygrometer for 0$ !! (great for your childrens!)

Since I posted my last instructable about simple science (you can check it out here) it get 41,501 views, so I decided to post another one. And today you will learn how to make a simple hygrometer, Another project that is fun to make with kids, and it is educational as well. You will need... He...

By: kondzio29



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from Instructables: exploring - technology http://ift.tt/1xngoJK