Feature:1. Quick Testing: This reusable card can accurately measure ultraviolet radiation within 10 seconds.2. Cover Testing: Place the card at the irradiation point under the UV lamp (within 5 cm from the lamp) to check if the lamp is available.3. Recyclable Times: If the card does not change to purple, you need to change the light bulb, when used in increments of 10 seconds, the card can be used 500 times.4. Easy to Test: 10 seconds to measure the reaction area of the UV test card shows purple, indicating that the bulb contains UV value.5. Premium Material: The quick test UVB sensor is made of high quality plastic material, which can be used for a long time.Specification:Item Type: UV Test CardMaterial: PlasticPurpose: UV Test.Package List:5 x Test CardNote:When not in use, please put the card in a card holder or store it in a dark place.