Feature:
1. Including anti-blue light card and blue light generator, easy to use.
2. Use blue light generator card shine on the white part, good using effect.
3. The stronger the blue light, the deeper the color change, convenient test.
4. To provide you with more professional services, used for eyeglasses test.
5. Reusable designs, including 10 set of the package, meet your demands.
Specification:
Condition: 100% Brand New
Item Type:
Anti-Blue Light Test Card + Blue Light Generator 
Material: Paper Usage: Anti-Blue Light Eyeglasses Test, Detection Blue Light Glasses reusable(repeated use: irradiated test card will automatically recover after 1 or 2 minutes)The stronger the blue light, the deeper the color changeTest Card Length: Approx. 8.5cm / 3.3inTest Card Width
: Approx. 5.3cm / 2.1in
Package List:
10 x 
Anti-Blue Light Test Card 
10 x Blue Light Generator