Plano-Cylindrical Concave Lens, +17 Diopter, 50 x 50mm Category_Plasticware letting students read low-cell voltages

letting students read low-cell voltages and high-tension supply outputs on the same meter

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

Tirrill burner on a stable octagonal base adds air

5-inch stainless steel rod cradle burettes

Plano-Cylindrical Concave Lens, +17 Diopter, 50 x 50mm Category_Plasticware letting students read low-cell voltagesPlano 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.