Feature(may vary by option.)
●Quick and easy to use，Just put the test card 5cm（1.96 inch） away from the heating lamp, wait for 10 seconds, can quickly test if there is an ultraviolet ray.
●After placing the card under the heat lamp for 10 seconds, and observe the detection area, the detection area turns from white to purple, indicating that the uvb bulb is working properly (you can also observe the shade of color to measure the intensity of UVB and UVA rays from UV fluorescent lamps)If the color doesnt turn purple, the bulb needs to be replaced.
●Can be reused 500 times, please put the card in the card holder or store in a dark place when not in use.（Cards degrade/fading over time）
●A must-have for UV lamps. Suitable for reptile.
●Package included:2/4 pack UVB Sensors
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Description
Quick and easy to use，Just put the test card 5cm（1.96 inch） away from the heating lamp, wait for 10 seconds, can quickly test if there is an ultraviolet ray. After placing the card under the heat lamp for 10 seconds, and observe the detection area, the detection area turns from white to purple, indicating that the uvb bulb is working properly (you can also observe the shade of color to measure the intensity of UVB rays from UV fluorescent lamps)If the color doesnt turn purple, the bulb needs to be replaced.