UVB Reptile Light Meter Quick Portable Test Card UV Detector Sensor Tester Indicator Over 500 Times Reusable Used for Reptile Heat Bulb Light Lamp (2 pcs)

It does work, the UV detector is a great asset to anyone who keeps anything that requires UVB including reptiles. I used it to find out that none of the reptile bulbs I have emit UVB but my saltwater light that has a UV setting does emit UVB.The temperature side is nice as well it was cool to watch it change colors quickly and accurate according to the reptile thermometer I already use. A good purchase in my book.

Got no reading from my bulbs. Bought a solarmeter and found I had uvb,not as much as I wanted 1.8 at 2 inches, the card registered nothing. Spend the $200 plus and really know your uvb.

Not sure if these really work it did change colors but not sure if it's really true what it says

Not effective, no color change. Does not change color for UV detection. Only good for temperature card. Both card does the same. Another brand would pickup a light purple, 2 inches away.

The UVB "meter" does not work and the lcd thermometer numbers are not accurate and are hard to read. Go with a digital UVB gauge if you are serious.

This card does not test for UVB it only tests for UV. Inaccurate description.

Don’t waste your money

Used it to test all my lizard lights. Needed to replace one. It worked well, was easy to use. Will definitely buy another on the future.