Features: brand new and high quality You can get a result in seconds about the type of UV light (UV or UVB)that your uv sanitizer device is using. Hold the UV test strips close to the UV light device. When purple logo lights up, means the light contains UV. When green logo lights up, means the light contains UVB, the brighter the logo is, the stonger the UV or UVB is. When test is over and stop irradiating the uv light to the UV test card, the purple logo light will extinguish in about one minute, the green logo light will extinguish immediately. This UV test cards fits for common UV/UVB Device, such as glasses, Automotive Film. Avoid strong light storage. Specifications: Material: PP Quantity: 10 Pcs Package Includes: 10X UV Test Cards note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.