Keep confidential data safe from prying eyes with a 3M Privacy Filter. With 3M micro-louvre technology, this frameless filter dims the screen for viewers to the side, making it exceptionally difficult to spy on what\'s on your monitor. It\'s easy to attach with a choice of two attachment methods, and can be removed and re-applied as necessary. It\'s the ideal choice for workers dealing with sensitive information. Privacy filter prevents others viewing your monitor 3M micro-louvre darkens screen outside of a 60 degree angle Also protects screen from dust and scratches Easy to apply, remove and re-apply as necessary Helps with compliance to Data Protection Act (1998) For widescreen ratio (16: 9) laptop screens measuring 21. 5\'\' diagonal