UNITED SCIENTIFIC Plastic Test Tube Racks, Wet/Dry, FOR 40 x 20MM TUBES

Economical yet very durable racks that are submersible, autoclavable, and easily stack when empty. Made from a special blend of polypropylene (PP) that makes them sink in a water bath and maintain their stability even in agitated water. The top tier features an alpha-numeric grid reference. Available in white, but can be special ordered in various colors.