Review on 🌈 Enhance Visual Experiences with Rainbow Symphony Diffraction Grating Glasses by Dave Brummet

I bought these for a class demonstration thinking they would be easier to use than 2x2 hand grids and they are really very handy no hands free and leave too both eyes participate. Users don't have to worry about where to hold the grid or how the orientation should be. Glasses are also larger and more visible than slides and easier to follow after class. As you can see from the product photos, the spectra are distributed horizontally (the bars are vertical), which is most convenient for most laboratory sources and easy for students to understand. At a relatively coarse 500 lines/mm, both first and second order spectra are visible .[I also bought a set of Rainbow Symphony 1000 lines/mm - Linear 1000 lines/mm, a pack of 50 for studies that require higher dispersion, but these unfortunately, turned out to have a different orientation of the gratings and the spectra are scattered along the vertical.]