2lb Hexagonal Cast Iron Mass with Lifting Ring Chemical_Polyvinyl Alcohol measuring wheel speed magnetically for

measuring wheel speed magnetically for fluid dynamics and hydrology investigations

and storage between uses at the laboratory bench

Three-dimensional plant meiosis model traces chromosome pairing

Five-hundred-gram bottle of laboratory-grade tribasic sodium phosphate (Na3PO4)

Wall-powered halogen ray box producing convergent parallel rays bright enough to trace in normal classroom light

2lb Hexagonal Cast Iron Mass with Lifting Ring Chemical_Polyvinyl Alcohol measuring wheel speed magnetically forLifting ring topped 2 pound cast iron hexagonal mass labeled with its weight, sized 3 by 3. 2 by 1 inch for physics experiments on weight, mass, and force in classroom laboratory coursework.