water and solar power calculator
No worries about batteries running down in this calculator or that the light wont be strong enough to power it up! This unique desk tool runs on ordinary tap water. Its a cost-saving, convenient alternative to conventional batteries simply fill the replaceable battery with a few drops of water for 2-3 months of use. When the display starts to fade, just add more water! The water-powered battery lasts a lot longer than alkaline batteries and wont pose a threat to the environment. With all the features of a standard calculator, this innovative version is a practical accessory for home, the office or school.
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