Optical Lens Set, 2", 6-Piece, Convex and Concave Base Size_9 x 9" supplied dry so the user

supplied dry so the user adds acid and charges it before running heavy-current electrolysis loads

Higher-current 1000-ohm 0

Easy to clean and maintain

electrophoresis

and enzymatic activity

Optical Lens Set, 2", 6-Piece, Convex and Concave Base Size_9 x 9" supplied dry so the userSPHERICAL 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 edges GREAT FOR PHYSICS CLASSROOMS This optically true lens set is excellent for physics classroom demonstrations in optics and light refraction Set of Six Optically True Concave & Convex Lenses