Ever wonder how we know the composition of suns and stars far away in the universe? The answer is a spectrometer, the equipment that can analyze the light spectrum from any light source. You've read about it in textbooksnow you can hold it in your hand and observe the Sun's emission spectrum yourself.The spectroscope is made of optical glass. A composite prism and converging lens are installed in the vertical tube. Hold the spectroscope with the slit facing the light source; a parallel beam is formed through the slit and lens. As the beam passes through the prism, the dispersed spectrum can be directly observed. When observing fluorescent light, you can see distinct mercury emission lines (three bright lines) against a continuous background spectrum.When observing sunlight, use only reflected sunlight from a mirror. Never look directly at the Sun.This device enables various light spectrum analyses. It is a high-resolution, simple, and economical tool suitable for hobbyists, amateur scientists, students, laboratory use, and science fair projects.Specifications: Material: Optical Glass Shell Color: Blue Size: 10 x 2.4 x 2 cm / 3.94 x 0.94 x 0.79 in Quantity: 1 Piece Note: Please allow 13 mm error due to manual measurement. Due to differences in monitor displays, the actual color may vary slightly from the image. Package Contents: 1 x Handheld Spectroscope 1 x User Manual