6-Piece Optical Lens Set, 3", Double Convex and Double Concave Base_Octagonal Needle valve and flame stabilizer

Needle valve and flame stabilizer deliver fine flame control on this liquid propane Bunsen burner for precision chemistry and biology heating work

and optic nerve

supporting three-rope compound arrangements for advanced mechanical-advantage investigations

Demonstrates the full light-to-electricity-to-motion chain through a solar cell

and inner ear sections support detailed auditory anatomy teaching at 3x enlargement for classroom visibility

6-Piece Optical Lens Set, 3", Double Convex and Double Concave Base_Octagonal Needle valve and flame stabilizerSix piece 3 inch optical lens set combining three double convex and three double concave glass lenses at 200mm, 300mm, and 500mm focal lengths for comparative refraction experiments.