Ever wonder how we know the composition of stars in the universe? The answer is a spectrometer, the equipment that can analyze light spectrum from any source. You have read about it in books—now you can hold one in your hand and observe emission spectra yourself! This spectroscope is made of optical glass. The collimating and converging lenses are installed in a vertical tube. Hold the spectroscope with the slit facing the light source; a parallel beam is formed through the slit and lens system. When the beam passes through the prism, the dispersed spectrum can be directly observed. If the light source is fluorescent, against the background of a continuous spectrum, distinct mercury lines (three bright lines) can be seen. When using for solar observation, use sunlight reflected from a mirror (do not look directly at the sun). This product is suitable for various light spectrum analysis applications. It is a high-resolution, simple, and economical tool ideal for hobbyists, amateur scientists, student laboratories, and science projects. Specifications: Shell Color: Blue Material: Plastic Size: 10 x 2.4 x 2 cm / 3.94 x 0.94 x 0.79 inch Quantity: 1 Pc Package includes: 1 x Spectroscope Note: Light and different display settings may cause the color of the item to appear slightly different from the real thing. Measurement allows an error of +/- 1-3 cm.