These UVA and UVC test cards are essential tools for anyone using . To use, place a card under the light for a few seconds. The card will display change, indicating the light's wavelength and intensity. This helps you verify that your light is functioning correctly and providing the necessary cleaning. Features -Color:Multi -Material:PVC -Size:7.00X2.50X0.10cm/2.75X0.98X0.04in - pvc: constructed from pvc material, these test cards are built to last, offering durability and reliability for repeated use -Comprehensive testing: these light detection labels can test both uva and wavelengths, providing comprehensive testing capabilities for different light sources -Userfriendly design: designed for ease of use, these uvc small test cards feature a straightforward plugandplay mechanism, eliminating the need for complex setup -Accurate readings: the light meters offer clear and precise readings of light wavelengths, ensuring accurate evaluation of light level for various applications -Wide range of uses: ideal for a wide range of light testing environments, these testing cards are suitable for use in laboratories, industrial settings, and more Package list: 20 x testing cards