Feature: [UV Test Card] UV test card is to test the germicidal effect of , it is easy to use, put the strip into the environment to be tested and wait for a few seconds. This UV test card works with common UV/UV equipment, UV sanitizing sticks, and other equipment. -[How to Use] Point a uvc dosimeter test card directly at any uvc light source, making sure the discolored area is always within the uvc exposure source. Take the reading immediately after the operating cycle for more accurate results. -[Easy to Understand Test Result] These UV Test Card have been designed to be simple to use and easy to understand. No confusing instructions and the card gives a clear indication of the test results. (Note: Instructions in English -[Note] Wear proper uvc anti goggles if anyone uses uvc light device. Uvc dosimeter cards should be kept dry and away from light and children. -[After-sales] We are committed to bringing customers a good shopping experience. If you have any questions about the uvc test card, you can contact our customer service, and we will do our best to solve the problem for you. Specification: Material: PVC Size: About 7.00X2.50X0.10cm/2.75X0.98X0.04inch Package Included: 10/100 pcs test cards Notes: 1.Due to the effects and shooting angles, the color of the item and that shown in the picture might have a nuance. 2.Due to manual measurement, there might be a tolerance in the product size