well, here in front of me i have a calculater which claims to run on water only without any battery... but i have to admit i'm not sure what a thermocouple is :) http://www.ubergizmo.com/15/archives/2007/12/waterpowered_calculator.html I guess they have a battery inside, yeah. But still :)
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timeasmymeasure
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Date: 2008-07-22 03:22 pm (UTC)http://www.ubergizmo.com/15/archives/2007/12/waterpowered_calculator.html
I guess they have a battery inside, yeah. But still :)