Description: 【3 in 1】: Reusable UVC Light Test Card is a double sided test. On the 1 hand, it can uv light and UVC light, mainly for whether the lamp is uv type, and on the other hand, it can test the remaining intensity of UV or UVC light . 【Easy to Use】: These UV intensity test cards are easy to use, easy to understand, and clearly indicate the test results. 【Easy to observe】: The high quality UV Dosage Indicator Card can be observed directly. When it is not exposed to light, the letters will disappear. UVC Light Test Card can be used in the box or under the light. 【Different uses】: UVC Light Identifying Card can be reused to detect different UV containing products. 【Note】: It is recommended that you store the card in the packaging case to protect the test area. Size Chart: 2.5cmx7cm/0.98inchx2.76inch Package Includes: 10 UVC Light Test Cards(4 Pack) Note: Please allow slightly errors due to manual measurement and different monitors.