Test Tube, plain, with bakelite screw cap & rubber liner, Material: Made from high quality, heavy duty, Borosilicate Glass, Dimension: 150x25mm, capacity: 50ml, pack of 12
Equilateral Prism, Material: optical glass, Perfect for optical refraction experimentation, Will create a rainbow with any standard light source (led from a phone will work), Because of their educational use design, do not affect physical function, Size: 75mm lengthx25mm face size