Privacy screens now come in 3 flavours: normal screen, wide-screen, and double-wide screen. As most new notebook computers now come in wide-screen formats, you need to be alert so that you won't buy the wrong size privacy filter. Take for example the 3M gold privacy filter for 13.3 inch notebooks. If your notebook screen size is 13.3 inch widescreen, then you should be getting the filter with the code "GPF13.3W". But if your notebook screen size is 6.52 inch by 11.57 inch, then you should be getting the double-wide filter with the code "GPF13.3W9".

The best thing to do when you decide to buy a privacy filter is to bring your notebook computer along and get the sales assistant to measure and then recommend the correct filter size for your notebook.