LED Ray Box with Slit Plates and Concave Lens, Battery-Operated Material_Nylon Borosilicate glass U-tube manometer with

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

and offer experience in experiment design

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

Four-times enlarged premium ear model with five separable sections exposes detailed outer

Green food coloring (5mL)

LED Ray Box with Slit Plates and Concave Lens, Battery-Operated Material_Nylon Borosilicate glass U-tube manometer withRugged 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.