These are some professional and convenient UV Light Testing Cards, aimed to provide reliable UV testing result in few seconds. Accurate measurement, perfect display of UVC-UVA effect, can be taken much more easily, bring you good using feeling. Suitable for testing disinfection box, disinfection cabinet, lamp and other environment. Features - Color: Assorted Color-Material:PVC- Size: 7.20X2.70X1.00cm or 2.83X1.06X0.39in - A professional test card specially designed for high-power UVC equipment, providing higher analyte contrast under high ultraviolet light. -High precision, simple operation,UVC Test Cards areeasy to carry with small size. - UVC test card for unprecedented quality control of UV analyte production and calibration. - Take one under the light. When the color of the card changes from white to dark purple or light green, your device is valid. - Sufficient number gives you the opportunity to repeat the test, and the accuracy of the result is guaranteed after repeated tests. Packing list: 30 x Testing Strips