UVA and UVC test cards are designed with a UVC test area and UV test area, Easy to use, when it is irradiated by UVA lighting, there is no display area. When it is irradiated by UVC lighting, green could appear in a green area with "UVC" letters. Features -Color:Assorted Color -Material:Paper -Size:7.00X2.50X0.10cm/2.75X0.98X0.04in - This card is made of unique paper materials, only to ultraviolet rays, and other visible light is . - Accurate measurement, card is perfect display of UVC-UVA effect, bring you good using feeling. - Enough quantity. UVC-UVA cards are enough for you to use, you can prepare them as a backup. - Place the UV area of the card in the sun, the stronger the UV in the sunlight, the darker the color. - UV light , technology to provide UV readings in few seconds, great for meet your needs. Package list: 6 cards