"The Mystery of Lyle and Louise"

1 pound of black sand packaged in a heat-sealed bag.

Bulk hole plates to expand your TeacherGeek collection

For Versatile Optical Applications

Ceramic Ring Magnets have a high resistance to demagnetization and don't need a keeper.

Glass thermometers with Enviro-Safe Black liquid.

Individual spherical glass lenses.

Makes demonstrations viewable by the entire classroom.

Ideal selection for use with a ray box.

Provide a convenient way to illustrate the properties of lenses to students.

Superior Grade Rubber Offers Softness, Resiliency, and Durability.