Optically Worked Double Concave Glass Lens, 75mm Diameter, 500mm Focal Length Subcategory_Stirring Bars and Rods and tissue preparations for classroom

and tissue preparations for classroom use

Aluminum mounting pulley with a 2-inch (50mm) diameter wheel and a tapped hole sized for rods up to 13mm

and standing waves visibly enough to compare amplitude

Aluminum-handled collecting net swings lightweight through tall grass and air sweeps for classroom field trips and introductory entomology sampling work

and gray links in a 4-compartment storage case

Optically Worked Double Concave Glass Lens, 75mm Diameter, 500mm Focal Length Subcategory_Stirring Bars and Rods and tissue preparations for classroomVery long focal 75mm double concave glass lens at 500mm focal length, the gentle diverging curvature yielding subtler virtual image reduction for nuanced refraction work.