Water powered, 8 digit display compact calculator, ideal for School or home use.

Powered by the revolutionary H20 water battery - this patented technology utilises two electrodes made of special alloys, when immersed in water the resulting chemical reaction produces electricity.
To maintain a constant supply of energy, simply refill the battery as the water evaporates - typically every 2 to 3 months.

(The battery has a minimum continuous life of 2 years).