High quality 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 textbooks, now you can hold one in your hand and observe emission spectra yourself! This spectroscope is made of optical glass. The composite prism and converging lens are installed in a vertical tube. Hold the spectroscope with the slit facing the light source; a parallel beam is generated through the slit and converging lens. When the parallel 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, you can see the spectral lines of mercury (three distinct lines). When using it for light observation, use reflected light from a mirror (do not look directly at the sun or bright light sources). 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 labs, 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 Piece Package includes: 1 x Spectroscope Note: Light and different displays may cause the color of the item in the picture to appear slightly different from the real thing. Measurement allows an error of +/- 1-3 cm.