6-Piece Optical Lens Set, 1.5", Double Convex and Double Concave Entomology & Zoology_Entomology Supplies 5-inch wood-framed demonstration manometer with

5-inch wood-framed demonstration manometer with a borosilicate 3

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

Tirrill burner on a stable octagonal base adds air

pre-assembled on a benchtop base for hands-on fluid-mechanics demonstrations

6-Piece Optical Lens Set, 1.5", Double Convex and Double Concave Entomology & Zoology_Entomology Supplies 5-inch wood-framed demonstration manometer withSix 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.