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 various sources. You've 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. Composite and converging lenses 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 dispersion spectrum can be directly observed. If the light source is fluorescent, against the background of a continuous spectrum, you can see distinct mercury spectral lines (three bright lines). When using it for observation, use reflected light from a mirror (do not look directly at the sun or bright light sources). This product is suitable for basic light spectrum analysis. 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: Other items shown are not included. Light and display differences may cause slight color variation between the image and the actual item. Measurement allows an error of +/- 1-3 cm.