Explanation: Have you ever wondered how we know the composition of the sun and stars far away in the universe? The answer is a spectrometer, an amazing piece of equipment that can analyze the spectrum of light from any light source. You have read it in text books, now you can have it in your hand and observe the spectrum of the sun's emission yourself! The spectroscope is made of optical glass. A composite prism and a convergent lens are installed in a vertical tube. Hold the spectroscope tube, the slit facing the light, and parallel beams are generated from the slit and converge lens. When parallel beams pass through a prism, the dispersion spectrum can be directly observed. If the light source is fluorescent light, the spectrum of the mercury lines (three straight lines) can be seen against the continuous spectrum. When you use it to observe sunlight, use light reflected from the sun from a mirror (not directly face to face with the sun). This product can be used for various light spectrum analysis. It is a high-definition product, simple and economical for hobbyists, amateur scientists, student laboratories and science fairs. Specifications:Material: Optical GlassShell Color: BlueSize: 10x2.4x2cm/3.94x0.94x0.79"Quantity: 1pcNote:Please allow 1-3mm error due to manual measurement. Pls make sure you do not mind before you make a bid, due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!Package Contents:1 x Handheld Spectroscope1 x User Manual