Versatile and inexpensive, this low-intensity light source can be used to observe the mercury emission spectrum or for interferometry (with filters). You can isolate the principal mercury wavelengths with the filters provided. You get four color filters (red, blue, green and yellow) and a diffuser. Operates on 115V, 50/60 Hz. Includes instructions. Size: 8 x 13.5 x 8cm high.