ReptiZoo UV Sensor 2pk

This reusable card can measure ultraviolet (UV) radiation accurately in 10 seconds.

Hold the card under the UV lamp at the basking site (within 5cm distance to the lamp) to check if the lamp is available or not. “Purple” light will be shown on the card under the UV lamp, and means that the lamp is available.  Replace the bulb regularly or sooner if the card doesn’t show any color, card can be used up to 500 times when used in 10-second increments. Two cards in each pack! this is a must have tool to keep if you use UVB lights