Ever wonder how we know the composition of suns and stars far away in the universe? The answer is a spectrometer, the amazing equipment that can analyze light spectrum from any light source. You have read about it in textbooks, now you can hold one in your hand 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 generated from 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 light, against the background of the continuous spectrum, line spectra can be seen. When using it for sunlight observation, 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 inches Quantity: 1 Pc 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 picture may not reflect the actual color of the item. Thank you! Package Contents: 1 x Handheld Spectroscope 1 x User Manual