Hottptyer Anti blue light test card 10 Set Reusable Designs Easy to Use Shows color change through the detection during eyeglasses with a generator for testing

[COMPLETE TEST SET] Each package includes an anti blue light card and a blue light generator card for convenient testing. The 10 set quantity supports repeated checks of eyeglasses and helps meet routine testing needs at home or in professional use. [EASY OPERATION] Shine the blue light generator card onto the white part of the anti blue light card to begin the test. The simple process requires no complicated setup and makes it easy to observe the card response during each check. [CLEAR COLOR RESPONSE] A stronger blue light creates a deeper color change on the test card. This visible response helps users compare light intensity and observe the performance of eyeglasses during an anti blue light test. [EYEGLASSES TESTING] Designed as an anti blue light test tool for eyeglasses checks the card and generator work together to provide a practical testing method. Use them to examine lenses and support more professional testing services. [REUSABLE DESIGN] The cards are made for repeated testing rather than one time use. With 10 sets included you can keep spare sets available for continued eyeglasses checks daily testing or professional service needs.