Gold Leaf Electroscope Superior.

The Gold Leaf Electroscope Superior is crafted with an anodized aluminum case, featuring sliding glass panels on two sides to shield the delicate leaves from air currents without obstructing visibility

It includes a metal terminal disk, connected via an insulating post to a fine gold leaf or thin foil strip. Two leaves hang from this conductor inside the enclosure

Comes with two gold leaf sheets, which are supplied separately and must be attached by the user following included instructions