Great Gizmos Mud Clock 6506

With the Great Gizmos Mud Clock guess What! No batteries! Be a scientist as you discover how to run this digital clock using earth. Experiment to find out what other substances will power the clock- you'll be amazed! Contains digital clock with leads, connecting blocks, copper string, zinc strips, length of wire and detailed instruction with fun facts

Manufacturer: Great Gizmos
Model: 6506 Mud Clock