6-Piece Optical Lens Set, 1.5", Double Convex and Double Concave Entomology & Zoology_Entomology Supplies Used to introduce photoconductivity and

Used to introduce photoconductivity and light-controlled circuits

Eccentricity-of-center-of-gravity apparatus with a ductile parallelepiped and central plumb line

this pack of premium qualitative filter paper offers medium-speed gravity filtration with a 10-micron pore size at 85 gsm weight

and reproductive systems for amphibian anatomy teaching

6-Piece Optical Lens Set, 1.5", Double Convex and Double Concave Entomology & Zoology_Entomology Supplies Used to introduce photoconductivity andSix piece 1. 5 inch optical lens set with three double convex and three double concave lenses at 200mm, 300mm, and 500mm focal lengths for comparing converging and diverging behaviors.