Free-Standing Wooden Lens Holder for 50mm Lens Human Anatomy_Human Anatomy Charts & Models Pack of 6 borosilicate 3

Pack of 6 borosilicate 3

4A single-phase rheostat with cover-protected constantan winding on a 200x56mm tube and 4mm safety socket terminals

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

Eight aluminum-shank tuning forks tuned to scientific pitch (C4 = 256Hz) and ranging from 5 9/16 to 7 1/8 inches

with thumb-wheel jaw movement for fine dimensional precision

Free-Standing Wooden Lens Holder for 50mm Lens Human Anatomy_Human Anatomy Charts & Models Pack of 6 borosilicate 3Holds 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.