Hand-Painted 3D Starfish Sectional Anatomical Model on Base, 18 x 16 inch Light & Optics_Spectroscopy Labeled-terminal 50-ohm resistance unit at

Labeled-terminal 50-ohm resistance unit at 7

Used to produce concentric Newton's rings under monochromatic light

Copper-block plug key switch with two 4mm terminals and a removable plastic-guarded plug

and membrane systems for introductory cell biology teaching

Open back reveals spine and posterior musculature while the head section preserves upper-body context

Hand-Painted 3D Starfish Sectional Anatomical Model on Base, 18 x 16 inch Light & Optics_Spectroscopy Labeled-terminal 50-ohm resistance unit atThree dimensional starfish sectional model reveals echinoderm anatomy, water vascular system, and radial symmetry for marine biology teaching.