These light testing cards are a convenient way to ensure your are working effectively. To use, simply place a card under the light for a few seconds. The card will change color, indicating the presence and intensity of UVA and . This helps you maintain and effective cleaning process. Features -Color:Multi -Material:PVC -Size:7.00X2.50X0.10cm/2.75X0.98X0.04in - material: crafted from pvc, these uvc test strips are sturdy, designed to withstand frequent use without degradation -Comprehensive light testing: capable of testing both uva and uvc wavelengths, these cards offer comprehensive testing capabilities for various light sources -Easy to use: featuring a userfriendly plugandplay design, these test cards require no additional setup, making them convenient for quick and easy testing -Accurate and clear: the uvc test papers provide clear and accurate readings of light wavelengths, ensuring precise evaluation of light in different settings -Versatile applications: suitable for a wide range of light testing scenarios, these testing cards are ideal for use in laboratories, factories, and other professional environments Package list: 20 x testing cards