6pc Optical Lens Set, 2" - 200mm, 300mm, 500mm Focal Lengths - 3 Double Convex & 3 Double Concave, 2" (50mm) Diameter Lenses - Optically True Glass - Ground, Beveled Edges - Eisco Labs bee and designed to hold up

and designed to hold up strong for years to come

the minimum complete shrinkage temperature is 110 ℃

which is complied with requirments for materials in contact with food and drinking water

Ergonomically designed fluted body with radial gripping ridge - provides an ideal surface for gripping and pulling

multi-angle viewing

6pc Optical Lens Set, 2" - 200mm, 300mm, 500mm Focal Lengths - 3 Double Convex & 3 Double Concave, 2" (50mm) Diameter Lenses - Optically True Glass - Ground, Beveled Edges - Eisco Labs bee and designed to hold up6pc Optical Lens Set, 2" 200mm, 300mm, 500mm Focal Lengths 3 Double Convex & 3 Double Concave, 2" (50mm) Diameter Lenses Optically True Glass Ground, Beveled Edges Eisco Labs Product Features SPHERICAL Each lens is spherical in shape and measures 2" (50mm) in diameter FOCAL LENGTH VARIETY Converging and diverging focal lengths in 200mm, 300mm and 500mm OPTICALLY WORKED GLASS Made of high quality, optically worked glass. Highly polished with ground