All you need to do is fill the reservoir with water and the clock starts working. Inside the reservoir, the water becomes an electrolyte, allowing two metal pieces to act as a conventional battery. By adding a bit of lemon juice you can help to enhance this process. The only maintenance required is to change the water periodically. It measures approximately 4" x 3.5" (Instructions included)
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Arbor Scientific is a leading provider of Physics and Physical Science teaching equipment tested and approved by educators recognized for their expertise. Arbor Scientific works with teachers at all levels to find the ‘Cool Stuff’ – unique demonstration and laboratory tools – and then provides lesson plans, supportive teaching guides and science teaching supplies to make each learning experience fun and effective.