Diffraction Grating Slides-Linear 1000 Line/mm

Very cheap price. Excellent results. I use this to check the pass frequencies of colored filters used for photography and my Telescope.I think the material is high quality, they may be selling this at a deep discount because of faint smudge or scratch that doesn't affect the results.

These work as expected for plastic diffraction gratings. They should have been packed a little better to avoid scratches but these are really meant for demonstration for education purposes not to build scientific instruments.

I had purchased the 500 L/mm version but wanted a little more resolution. This 1000 L/mm provides more detail in the spectrum and is made very nice. The slide is cardboard so it needs to be handles with care. You can use it without any other setup but to see a detailed spectrum you will need a way mount this in a spectroscope. Good spectroscopes are not cheap but this can replace the prism in older units to provide greater detail of the spectrum.

was a replacement for damaged slide, does not work as well as old one did, came with a scratch

this company contacted me regarding a mediocre review that I submitted for this item - SEOH contacted me and asked why did I give this a 3 star rating - I replied that I only briefly looked at the grating to see if it was working , it was. Amazon then contacted me for a product review almost immediately - I had not had enough time to test it , so gave it an average rating. I have since tested it and it works just fine - creating a usable spectrum for an amateur spectroscope. Slow down , Amazon!

Very Poor quality. Grating film is mounted with bulges and wrinkles. The grating has obvious scratches and smudges. As is, not useful as anything other than an amusement.

Mine arrived badly scratched. It is minimally useful.

Dear Lady or Sir,I have received my order parcel on time, there is no any problem everything is ok. Thank you very much for everything.Best RegardsNotice:Order parcel can be a problem that for were it is flexible.