Free-Standing Wooden Lens Holder for 50mm Lens Human Anatomy_Human Anatomy Charts & Models fixed bipolar 8V and high-voltage

fixed bipolar 8V and high-voltage 125/250V DC outputs

with thumb-wheel jaw movement for fine dimensional precision

Double-pole double-throw brass knife switch

the thinnest gauge for mounting the smallest and most delicate insect specimens in permanent displays

Suspends a 20mm solid zinc cube from a spring scale for water-displacement density measurement

Free-Standing Wooden Lens Holder for 50mm Lens Human Anatomy_Human Anatomy Charts & Models fixed bipolar 8V and high-voltageHolds 50mm diameter lenses upright on a free standing wooden base, the simple mount steadying optics elements at bench height for refraction, image formation, and ray tracing demos.