This closed case form of an Electroscope is an economical, sturdy workhorse for student labs. The enclosed case prevents air currents from affecting the deflection of the leaves. Leaves are a combination of gold and aluminum developed to provide strength without sacrificing sensitivity. Each leaf is suspended from two small hooks, making installation simple. When charged the leaves pivot, rather than bend. . Leaf support rod is held in place by an insulating plastic sleeve. All plastic construction.