Plano-Cylindrical Concave Lens, +17 Diopter, 50 x 50mm Category_Plasticware supporting beakers and flasks above

supporting beakers and flasks above a heat source without slipping on the bench surface

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

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

5-inch stainless steel rod cradle burettes

Funnel has a 19/26 size socket and includes an interchangeable plastic stopper

Plano-Cylindrical Concave Lens, +17 Diopter, 50 x 50mm Category_Plasticware supporting beakers and flasks abovePlano 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.