High quality and low cost make this ideally suited for junior high or high school students.

• Includes on/off switch
• Slotted screen for multiple light rays

It is durably constructed with a rigid vinyl base and a metal box housing a transformer and a high intensity light. An adjustable screen produces either one wide beam or a choice of one, three, or five slit beams, all of which can be easily seen tracing a path across the table surface on which the unit sits.