Plano-Cylindrical Concave Lens, +17 Diopter, 50 x 50mm Category_Plasticware Hand-painted 4-part human brain model

Hand-painted 4-part human brain model separates into cortical hemispheres and brain-stem regions for lobed-anatomy teaching at introductory biology levels

Locking control at any extension on this two-meter retractable tape measure

5-inch stainless steel rod cradle burettes

Five removable sections separate the enlarged ear into outer

sized so that students can charge an outer pail and watch the inner pails register zero charge during the classic ice-pail demonstration

Plano-Cylindrical Concave Lens, +17 Diopter, 50 x 50mm Category_Plasticware Hand-painted 4-part human brain modelPlano cylindrical lens at 50 by 50mm with 17 diopter optical power and ground polished edges, the cylindrical curvature focusing light to a line rather than a point in optics demos.