Flask Form Electroscope, 1 Each

The Flask Form Electroscope by United Scientific is a classroom electroscope housed in a 250 mL borosilicate flask, with a metal rod through a rubber stopper and a pair of aluminum leaves on an alligator clip. Charge applied to the top knob makes the leaves separate, giving students a clear visual signal. Science teachers use it for hands-on electrostatics activities on charging by contact and induction, with an activity guide included.