13,500 Lines/inch Diffraction Grating Sheet - Double Axis [5 Feet x 6 Inch Roll] auspowers_batchfive not easy to fade or

not easy to fade or break for a long time

and remains soft even after freezing

they contain 1/100th the amount of chemical compared to most commonly used test strips

It also includes an e-book with tips and tricks

13,500 Lines/inch Diffraction Grating Sheet - Double Axis [5 Feet x 6 Inch Roll] auspowers_batchfive not easy to fade or13,500 Lines inch Diffraction Grating Sheet Double Axis [5 Feet x 6 Inch Roll] Product Features Produced with the goal of minimizing noise ensuring you get a clear view of the color spectrum One 6 x 60 sheet with a double axis that has 13,500 Lines inch These sheets can be used over and over again, as long as they are kept clean and crinkle free You can directly view and analyze spectra from different gas tubes and other light sources with these large