6-Piece Optical Lens Set, 1.5", Double Convex and Double Concave Entomology & Zoology_Entomology Supplies Teaches proper brushing technique through

Teaches proper brushing technique through a 3x life-size jaw model with gums and oversized toothbrush

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

lets students compare how line density per unit length controls the spacing of the resulting interference pattern

Used to demonstrate temperature-dependent resistance

6-Piece Optical Lens Set, 1.5", Double Convex and Double Concave Entomology & Zoology_Entomology Supplies Teaches proper brushing technique throughSix 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.