Einstein would have loved this!  The only thing standing between you and figuring out the mechanics of our universe is a few drops of water.  Just fill this calculator with water and it will be ready to add, multiply, subtract, divide or whatever.

This calculator offers a full range of functions and operates off ordinary tap water for weeks before a refill is needed.  NO batteries required or even allowed!

Why Buy This Stuff?
Can you really make a calculator interesting? Can you give a calculator as a gift? With it's unique water battery, this one qualifies!