Product review for Card-Mounted Diffraction Viewers Please read our review guidelines and see the terms of use of posting a review. Overall Rating: and share your thoughts with other customers Sort Reviews: Newest | Oldest | Highest Rating | Lowest Rating   :: Viewing page 1 of 1  -  Monday, September 10, 2007 grating Reviewed By: Marty (Marshall, Wisconsin) Beware, this is a dual axis grating, and will give a square of dots out of a laser, not a single row.  -  Wednesday, July 29, 2009 Great for vieing gas tubes Reviewed By: Christine  (Baltimore, MD) Have used these successfully for 5 years to make spectrascopes from a box. We then use them to view a varity of light sources and gas tubes. It shows the spectra of the different gases clearly.

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