Features:
Accurately test the effectiveness of your glasses with this set of blue light test cards. your eyes from harmful electronic device radiation.
This blue light detection card is a pratical tool. The strong the blue light, the deepthe color change, which is convenient to test.
Suitable for individuals who spend long hours use electronic device, such as students, office worker, and programmers, as well as those concerned about maintaining eyes.
Applicable in various environment like home, offices, and schools, these test cards allow you to easily evaluate the blue light blocking effectiveness of your glasses. effective eyecares whenever necessary.
Improve your eye health with these user friendly glasses test cards. Stay aware of potential eye strain and enjoy enhances visual comfortable.

Specifications:
Paper
Quantity:1Set,5Set (optional)
Card Size:Approx.50mm/1.97''x100mm/3.94''

Note:
Please allow 1mm errors due to manual measurement.
Due to the differences between different monitors, the picture may not reflect the actual color.

Package includes:
1Set / 5Set Blue Light Test