and Ever wonder how do we know the composition of and stars in the universe? The is spectrometer, the equipment that can analyze light spectrum from any . You have read it in text books, now you can have it in your hand and observe '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 tube, the slit facing the light, a parallel beam is generated from the slit and converging lens. When the parallel beam pass through the prism, the dispersion spectrum can be directly observed. If the is fluorescent light, against the background of the continuous spectrum, one can see spectra of mercury (three straight lines). When use it for light observation, use 's reflected light from a mirror (Do not directly face the ). This product can be used for a of light spectrum analysis. It is a high-resolution, simple, and economical product for hobbyist, amateur scientists, student lab and science projects. Specifications: Shell Color: Blue Material: plastic Size: 10x2.4x2cm/3.94x0.94x0.79 inch : 1 Pc Package includes 1*Spectroscope Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.