This is a vintage electric circuit probe tester. The tester is clear plastic and features 6-12V, a silver metal probe with a pointed tip at the end and a black cord attached to the top, and a crocodile earth clip at the end.
It measures about 6" tall, 0.5" wide, and 20" long for the cord.
This item comes in good pre-owned condition. The tester has not been tested and is being sold as-is.