CrystalTech Nano Liquid Screen Protector is the very latest development of the nanotechnology industry. Our new liquid formula created in partnership by our R&D department and the best European scientists strengthens the hardness of the mineral glass of your mobile phone and other devices adding further protection against scratches and shocks. The normal hardness of glass screen is around 3H and with the best film protector maximum 5H. NanoProtect + increases your phones and devices to 9H CrystalTech Nano Liquid Screen Protector protects anything made in mineral glass -ie lens for cameras or optical glasses and has many benefits and remarkable fCNCryseatures which are proved scientifically.