LED Ray Box with Slit Plates and Concave Lens, Battery-Operated Material_Nylon providing the high-turns winding for

providing the high-turns winding for transformer ratio and electromagnetic induction demonstrations

and left hemisphere

Compact 2mm-plug connecting lead in the small-scale lead family

Borosilicate glass U-tube manometer with a built-in stopcock mounted on a back-plate 80-0-80 scale at 2mm subdivisions

Twelve-position rotary capacitance substitution box selecting one capacitor at a time

LED Ray Box with Slit Plates and Concave Lens, Battery-Operated Material_Nylon providing the high-turns winding forRugged ABS molded enclosure houses cool running LED optics across seven accessory grooves, supplied with two slit plates, two blanks, and a concave lens for ray tracing studies.