20-22 Inch Anti Blue Light Screen Protector for DIAGONAL 20, 21.5, 22 Inch **BEFORE ORDERING: 1. Measure monitor diagonal size without edges. 2. The width and height of computer blue light blocking screen protector 20-22 inch (20 inch, 20.1 inch, 20.2 inch, 21.5 inch, 21.6 inch, 22 inch) is width 490 mm * height 317 mm. Screen protector adopted Japanese Fujimori nano-optical stacking technology, effectively blocking blue light ≥90%, UV blocking ≥98%, blocks other harmful lights ≥99% Removing the screen adhesive films on both sides before installing the blue light filter for the computer monitor. Condition: New in Open box