Optically Worked Double Convex Glass Lens, 75mm Diameter, 100mm Focal Length Entomology & Zoology_Zoology Charts & Models and acrylic in a foam-lined

and acrylic in a foam-lined wooden case for density-versus-material investigations

plus a removal tool in a 4-compartment storage box

5-inch stainless steel connecting rod

the workhorse high-impedance unit for low-current voltage-divider and signal-conditioning work

this polypropylene graduated cylinder set is Class B-tolerant

Optically Worked Double Convex Glass Lens, 75mm Diameter, 100mm Focal Length Entomology & Zoology_Zoology Charts & Models and acrylic in a foam-linedOptically worked double convex glass lens at 75mm diameter and 100mm focal length, the f 1. 3 geometry favoring strong convergence and bright real image formation across a wide aperture.