CONVECTION APP FOR LIQUIDS, Case of 50

Details

Here is the corrected text: This liquid convection apparatus is an effective method for showing normally invisible currents. The rectangular glass tube has an opening at the top where you can pour water and introduce dye (available separately). When a corner of the tube is heated, the current becomes visible through the movement of the dye. Dimensions: 8¼" in length, 6" in width. Cat. No.: 470148-912.