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 have read about it in textbooks, now you can hold one and observe the Sun's emission spectrum yourself. The spectroscope is made of optical glass. The 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 from 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 the continuous spectrum, you can see the line spectra of mercury (three distinct lines). When observing sunlight, use only the Sun's reflected light from a mirror (do not look directly at the Sun). This product can be used for a variety of light spectrum analyses. It is a high-resolution, simple, and economical tool for hobbyists, amateur scientists, student labs, 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 1–3 mm error due to manual measurement. Ensure you are comfortable with this before purchasing. Due to differences between monitor displays, the image may not reflect the actual color of the item. Thank you. Package Contents: 1 x Handheld Spectroscope 1 x User Manual