Selens 2Pcs Non-Adhesive Polarized Film A4 7.8x11.8inches Polarizing Film for Physics Education, Photography, Experimental

At first, I put them together while the protective film was still on to confirm that they did work, but the result was nothing. I noticed the tabs on the protective film said screenguard, so I thought I got scammed and these were screen polarizers which do not work for polariometers or polariscopes. As a last ditch, I removed the protective film since maybe the plastic is messing with the light and scrambling it again, and alas, it works! It behaves exactly as it should, and while indeed it does not block light perfectly as others mentioned, this is the result to expect from all plastic polarizers and you won't get total blocking unless you spend hundreds on crystal based polarizers or whatever. For the price this is decent, especially because its a large sheet

Worked perfectly. Used this to invert mod my Casio F91W. Package came damaged but I put that more on the Amazon delivery driver. Luckily there was enough undamaged material that I could use. I love the blacked out face now.

Works perfect, but there is only a protective film on one side, and the unprotected side is very easy to scratch.

Excellent product!

Product came opposite of as described almost as if it was cut and patched up .