what is 9h tempered glass

9H tempered glass is a type of screen protector that is extremely scratch-resistant, wear-resistant, and durable. The "9H" refers to the Mohs scale of mineral hardness, which Friedrich Mohs invented in 1812. The scale ranges from 1 to 10, with diamond at the top of the scale and glass around 5. The scale is represented by numbers only without the "H" suffix. The suffix means the hardness of a pencil. To find a rating, you use the pencil test, which compares the relative hardness of a screen. When a manufacturer claims that their screen is 9H, it means the screen can resist scratches from the hardest pencil. Tempered glass is the hardest of all screen protectors when it comes to scratch resistance. It is made of laminated tempered glass, similar to the devices original screen they are meant to protect. The 9H tempered glass screen protector is designed with a 3D curve to cover your phone from edge-to-edge, remaining intact even if the edges get hit. It is coated with special oleophobic and hydrophobic coatings, making it water, oil, and fingerprint resistant.