Experimental circuit demonstrator and the student test circuit board are supplied to senior high schools in demonstrating and separating for 10 basic electronic experiments altogether. All parts of the apparatus were welded in each transparent plastics box, and these boxes can be expediently inserted or pulled out of the scale board; On the scale board, the nine eyelets combined with the “田” are connected, they can be used as a node when we do experiments. Electric circuits of experiments can be conveniently and reliably connected.