Lens Holder for 50mm Lens with 8mm Rod Attachment Pack Size_8 each output protected against overload

each output protected against overload and short-circuit conditions

and pendulum period in physics experiments

Entry-level two-part human skull model separates the skull cap to reveal the cranial cavity for introductory head-anatomy teaching at secondary and college levels

and chamber walls at a scale visible for group demonstrations

Ovary model exposes cortex

Lens Holder for 50mm Lens with 8mm Rod Attachment Pack Size_8 each output protected against overload8mm rod attachment and a centered 50mm aperture together hold a lens square against an optical bench rail for repeatable refraction, focal length, and image formation experiments.