These light testing cards are designed to help you monitor the performance of your . To use, simply expose a card to the light source. The card will change color, indicating the presence and intensity of UVA and . This allows that your light is providing the necessary cleaning for your needs. Features -Color:Multi -Material:PVC -Size:7.00X2.50X0.10cm/2.75X0.98X0.04in - pvc material: constructed from pvc, these meters are built to last, offering durability and reliability for repeated use -Versatile light testing: capable of testing both uva and uvc wavelengths, these sensor cards provide comprehensive testing capabilities for different light sources -Userfriendly operation: designed for ease of use, these test cards feature a simple plugandplay mechanism, eliminating the need for complex setup -Accurate and clear readings: the test cards provide clear and precise readings of light wavelengths, ensuring accurate evaluation of light level in various settings -Wide range of applications: suitable for a variety of light testing environments, these light meters are ideal for use in laboratories, factories, and other professional settings Package list: 20 x testing cards