Electric Buzzer Circuit tester for schools

This unit is ready to use - needs a battery. Pupils can then test various materials to see if they are electrical insulators/conductors

This electric circuit buzz box is to be used by children to find out what materials are electrical conductors. (You supply the battery - AA size).
Find a dozen different objects and simply touch the wires on the material and if the sounder buzzes you have found an electrical conductor, if not it is an electrical insulator. Write your findings on a table. Not to be used with any mains electricity