I bought a pair of these to use on my 23 inch monitors at the office and they are extremely efficient. become almost completely dark. Unfortunately, like all screen privacy filters, they are quite expensive, but they were still some of the cheapest filters I could find and they don't seem to suffer for their price. Installation was pretty easy thanks to the included double-sided tape. When installed correctly, the tape doesn't affect picture quality and isn't visible at all, which is nice. Glue the sheet and stick it on the monitor, but it only took a few minutes. Would happily buy them again if I needed screen privacy filters.
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