"The Mystery of Lyle and Louise"

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

Individual spherical glass lenses.

Individual spherical glass lenses.

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.

All Types and Sizes for all Optical Applications.

This replacement high-concentration diamond wheel is six inches in diameter.

Economical noncontact thermometer fits right in your pocket!