BEFORE ORDERING1. Measure PC monitor size without edges. 2. Please check the size chart to the confirm correct variation you need.3. The width and height of the 21.5 inch computer screen protector is 491 mm * 288 mm.(Incompatible with IMAC 21.5) ANTI BLUE LIGHT/UV/RADIATIONThe computer blue light blocking screen protector adopted Japanese Fujimori nano-optical stacking technology, effectively blocking blue light 90%, UV blocking 98%,blocks other harmful lights 99%. PREMIUM QUALITYDesktop computer screen protector for eyes protection with 8H reinforced acrylic materials, 5 layers of optical engineering protection with a high resolution view, real colors, scratch resistance, anti-fingerprint, Ultra-thin 2mm, explosion-proof. APPLICATIONEasy to use with Hanging type, anti blue light screen protector fitting on working, learning, playing games, watching TV and so on. Reducing eye strain, preventing myopia & dryness, hyperemia and so on, focusing on what you do, effectively impr
