23007-1 pointer electroscope

This product is composed of two identical pointer electroscope.
The pointer electroscope is composed of a casing, ball or disc, conductive rod, insulator, pointer, pointer frame, grounding column etc..
The pointer is made of a thin sheet of metal. The length is not less than 100mm, and the lower part is arrowhead shaped with red lacquer.
The surface diameter is 170mm, and the product support frame is 6mm in diameter, and the iron surface is chrome plated.