Diffraction Grating sheet 1,000 lines/mm Linear 1 Foot x 6 Inches Wide

Was delivered rolled tightly and within a plastic sleeve. It was in perfect condition. Once unrolled, it’s the size I ordered and when using it to look at light, the diffraction spreads out on the sheet- not too far for our use though.

I couldn’t even use it it had scratches and wrinkles. Waste of money I threw it in the trash I was so upset

I don't know what the rest of the reviewers here need a full sheet of this grating for. Yes, it comes wrinkled, but there are plenty of regions (> 3 cm x 3 cm) that are smooth and usable. You don't need a full flat sheet of this stuff to make a spectrometer or demonstrate diffraction.It's also not a shipping issue; it is already wrinkled from the seller.

I wanted to get one of these because I thought it was right up my alley. I had taken a physics class that used these to perform Young's double slit experiment, and I owned a laser, and I wanted to do that sort of thing in my spare time. The product came in a box and curled up (like a sleeping bag). However, a few minutes after enjoying the diffraction grating, I found out the slits appear to be sprayed on. Like, there is a coating that was applied and it(the coating) made those 1000 tiny little slits per millimeter. If I pressed my hands against the plastic the coating would vanish and there would just be standard, 0 slits per millimeter plastic. Water didn't cause this problem. Packing tape also cleared the coating. The coating was only on one side of the product.I didn't expect all that (spray like coating of 1000 slits per millimeter), but the price was good and I did enjoy the product. It's not 5 stars because it's not what I thought I would get, but the product was still reasonable. So if you buy this product, be careful touching it.

The review made me worry that it would be wrinkled up or folded. It arrived flat in a box well protected by a layer of protective sheeting. I am very pleased with this 6” X 12” sheet of diffraction grating.

The media could not be loaded. I am disappointed that this product has wrinkles. Can not use for intention.

The media could not be loaded. The colors are nice. There are creases in it from top to bottom and will mess up your projects. Very small sheet for the price. The product photo makes it look like it’s on a roll and it is really just a small sheet. So disappointed, the search continues.

Came in a fantastic packaging. It was straight and clean. It's so cool I want more. Also the size I got was not misleading for I wanted a small sample size. They have listed the price and sizing clearly.