Strong metal construction, coupled with a transparent front glass plate and a translucent back plate, makes this electroscope rugged enough for years of effective use in the standard classroom environment. Repulsion can easily be observed, with the graduated indicator plate clearly seen through the transparent side for measure of the degree of repulsion. Gold leaf used for the indicator provides greater sensitivity than the pivoting indicator needles commonly used in other versions.

• Case dimensions: 120 x 80 x 150 mm (4¾" x 3 1/8" x 5 7/8")
• Both front and back plates easily slide out for cleaning or servicing the gold leaf
• Accessory 4 mm socket for grounding the case
• Comes complete with instructions