Ever wonder how we know the composition of stars in the universe? The answer is a spectrometer, a device that can analyze the light spectrum from various sources. 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 parallel beam passes through the prism, the dispersed spectrum can be directly observed. If the light source is fluorescent, against a continuous spectrum background, distinct mercury emission lines (three bright lines) can be seen. For safe observation of sunlight, use reflected sunlight from a mirror (do not look directly at the sun). This product is suitable for basic light spectrum analysis. It is a high-resolution, simple, and economical tool ideal for hobbyists, amateur scientists, students, 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 in images are not included. Lighting and display differences may cause slight color variations between the product and the image. Measurement error is +/- 1-3 cm.