Fischuel Quick Test UVB Sensor, Reptile UV Tester Heating Lamp Photochromic UVB Card Indicator，Available with UVB, Suitable for Sunglass Test & Sterilizing, Over 500 Times Reusable (2 Packs)

- Simple Storage：Comes with 2-Packs UV sensor testing card and a card sleeve for easy carrying and storage.

- Easy to Test：Just place the testing card 3.5 inches away from the heating lamp and wait for 10 seconds, which can quickly test if there is an ultraviolet ray.

- Cover Testing：Cover the test card with your thumb，when the shows color difference between the thumb-covered and non-covered areas on the testing card, means that the UVB bulb is working normally.

- Recyclable Times：Suitable for sunglass test & sterilizing，reusable 500 times. When not in use, you need to put it in a card sleeve or store it in a dark place.

- Campatibility：UVB bulb and Fluorescent bulb, such heating bulbs that carry ultraviolet rays.