Proof Plane (E-3904)

E-3904 Proof Plane

For transferring charges from a charged object to another object in electrostatics experiments. Comprising of a circular metal disc mounted on top of an insulating handle.

E-3904/1 Metal disc of 50mm diameter mounted on insulating handle.

E-3904/2 Smaller metal disc of 25mm diameter mounted on the insulating handle.