2lb Hexagonal Cast Iron Mass with Lifting Ring Chemical_Polyvinyl Alcohol this 500g bottle of laboratory-grade

this 500g bottle of laboratory-grade sodium bicarbonate also serves as a CO2 source for endothermic-reaction demos

Pendulum kit with a calibrated protractor board

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

3 inches wide and 1

Three-dimensional plant meiosis model traces chromosome pairing

2lb Hexagonal Cast Iron Mass with Lifting Ring Chemical_Polyvinyl Alcohol this 500g bottle of laboratory-gradeLifting 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.