DescriptionUV light test card, technology to provide reliable UV readings in few seconds. Monitoring UV along with verifying that the optimal UV germicidal light wavelengths are being used in your disinfection process. Features- Color: White- Material: PVC- Size: About 7.00X2.50X0.10cm/2.75X0.98X0.04inch- Professional test cards designed for high power UVC devices offering a higher cards to analyte contrast on highly UV.- Resilient PVC material for high power exposure without aging/discoloration- UV test cards for unprecedented quality control for UV production and calibration.- When the color of the cards changes from white to dark purple / light green, your device is effective.- To avoid an increasing number of fake and defective germicidal UVC light products on the market today.