Density Set Polypropylene, Set of 12 Polypropylene cylindrical bars of different length but the same diameter. Students learn that the density of a substance is constant even as itsmass and volume change. Comes in an attractive wooden holder
Single Eye loupe-Style Magnifier, A high quality Eye loupe . The 25mm glass lens is mounted in a black plastic loupe. The magnification is 6x with a 51mm focallength.