These are some professional and portable UV light testing cards, designed for providing reliable UV testing result in few seconds. Accurate measurement, easy to use and convenient to take, perfect display of UVC-UVA effect, bring you good using feeling. Features -Color:Multi -Material:Paper -Size:7.00X2.50X0.10cm/2.75X0.98X0.04in - These UV light test cards are easy to use, just put it into the environment to be tested and wait for a few seconds. - UV test cards are good for UV analyze production and calibration control, very professional and practical, satisfy your demands. - Widely applied for testing boxes, cabinets, lamps and other environments, test cards are of great use. - Your device is valid when the card color changes from white to purple or light green, easy to observe the result. - Avoid an increasing number of fake and defective products on the today, bring you satisfying using feeling. Package list: 15 cards