These superior quality unmounted Double Convex Lenses with ground edges are useful for teaching a variety of optical principles.
These aprons are built for durability and protection from everything from natural materials to chemicals. The rubber cloth apron is impermeable and easy to clean.
These are high form porcelain crucibles with lid covers.
These screw form Hoffman Clamp allows added control by a screw type adjustment which allows more or less air or liquid through.