Features: Our Anti Blue Light Test Card effectively detects the amount of blue light radiation emitted by electronic device, ensuring healthy eyes. Convenient and easy to use, our test card accurately measure blue light radiation, providing reliable result for protecting your eyes. Perfect for individuals who spend long hours use electronic device, such as professional, students, and technology enthusiasts. Especially suitable for those with sensitive eyes. Use our test card in any environment where electronic device is used, such as home, in the workplace, and during activity. Adjust device usage habits to promote healthier eyes. Enhances your eye health with our Anti Blue Light Test Card. Reduce eye strain and discomfort excessive exposure to blue light from electronic device. Specifications: Material:ABS Quantity:1,10 Size:Approx.25mm/0.98''x85mm/3.34'' Package Includes: 1x / 10pcs Blue Light Glasses Test note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color.