Portable Anti- Blue Light Test Card PVC Material Reusable Polarized Sunglasses

Features: The stronger the blue light the deeper the discoloration. 1000 pieces in the packaging to meet your different requirements. Simple structure which provides convenience and easiness to operate. Can be used for a long term suits for personal home or store use. Designed to test blue light goggles use a blue light emitter to shine in the white square below. Package Includes: 100x Blue Light Test Card Specifications: Material: PVC Size: approx 39x61mm/1.5x2.4in note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors the picture may not reflect the actual color of the item.