🙈 - 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：Compatible with 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：3.0 ~10.0 UVB bulb and Fluorescent bulb, such heating bulbs that carry ultraviolet rays.
🌞 - 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：Compatible with 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：3.0 ~10.0 UVB bulb and Fluorescent bulb, such heating bulbs that carry ultraviolet rays.