Double Concave Glass Lens, 50mm Diameter, 250mm Focal Length, 3mm Thick Racks & Stands_Flask Stands 5 inches producing 50-60 dots

5 inches producing 50-60 dots per second via a vibrating striker

Color-coded life-size brain model distinguishes cortical lobes

230mm disc graduated 0-360 degrees in 1-degree steps locks in any position alongside a rotatable lamp house and six magnetic acrylic elements for full ray-tracing studies of reflection and refraction

88-inch face reading 0-2

Double Concave Glass Lens, 50mm Diameter, 250mm Focal Length, 3mm Thick Racks & Stands_Flask Stands 5 inches producing 50-60 dotsSlim 3mm thick double concave glass lens at 50mm diameter and 250mm focal length, the diverging curvature paired with low mass for ray box mounts and lightweight optics setups.