TK1407 Color polarization experiment device for li

The instrument consists of two circular polarizers. A mosaic in the bottom of a barrel, another piece is inlaid in the annular disk, such as a disk lid buckle on the drums and can rotate 360 degrees. The circumferential angles of the disc surface and the bottom of the barrel have an angle scale of 0-360 degrees. Outline size 31cm * 25cm * 38cm.