Electroscope Flask Form This electroscope is housed in a 250ml Pyrex flask with a metal rod attached to a rubber stopper. A pair of aluminum leaves is suspended from an alligator clip. The knob on top of the rubber stopper accepts a charge. When the charge enters the flask, the aluminum leaves separate. Also available are rod and alligator clip assembly for use with your own flask and replacement aluminum leaves. Flask Form Electroscope Qty :