QuantaDose® UVC Light Test Card with UVC Light Wavelength Indicator and Photochromic UV Intensity Test

Awesome device to measure uv rays in sunlight and tests efficacy of upf clothing hats and other items!!! Anyone with melanoma should have this!! Not all uof rated clothing is protecting you. This item demonstrates how good or bad item works.

I bought this card to test some sunglasses I have because I wasn't sure if they had any UV protection. It's so simple to use and it put my mind at ease.

Love this testing card.I tested a UV flashlight purchased on amazon. It showed the max amount of UV within a few seconds. Much faster than the sun. Makes me think twice about shining this UV flashlight in someone's eyes.Tested this on sunglasses, on an expensive pair, it blocked 100% of uv. On cheap sunglasses that say "100% uvab blockage", it didn't. If you purchase sunglasses often, keep this card with you so that you can test the sunglasses 30 seconds after purchase.Tested this on auto glass that was not tinted and according to this card tested better than the house windows.I used this to test Milgard windows with the suncoatmax low e-3 glass. The low e2 says it reduces UV "up to 84%." The E3 says that provides "additional protection from uv-a and uv B". According to the test card, my windows look like they only block 20% of UV. So "up to" 84% means 0-84%.

Worked perfectly. Only criticism is the reactive "bar" is slightly small.I used it to test some shirts from amazon that claimed to be UPF 50+. The card worked -- the shirts did not! Card showed shirts let through LOTs of UV light.(My polarized sunglasses let through zero as a test.)Also showed how UV is still a danger on cloudy days -- although lesser than direct sun.Buy this card, don't buy any clothing on amazon that claims to be UV- protective (aka UPF 50+.) Have to pay for real brands that test their fabric.

I have a retina problem and need to avoid UV rays. I went to three optical stores trying to get my sunglasses tested. None had a device to do it. Then I found this inexpensive card on Amazon. It does the job, giving an idea of the degree of protection. I also checked my families sunglasses. Nice product!

This thing really works! I used it to verify a UVB flashlight was blocked by UVB-resistant eyeglasses. I didn't test the UVC function. Strongly recommended when dealing with harmful UV light.

This is accurate and very helpful to measure UV rays for my Turtle!

As stated in the title, this card works perfectly. I first tested the UV sensor under direct sunlight and it showed a very strong ultraviolet reading. I then exposed it to my UV-C lamp while protecting myself from exposure using gloves and a hood over the lamp. While the card is exposed to the lamp, I get a very strong green UV-C reading, and after a few seconds, the ultraviolet sensor began to indicate the strength. Once you remove the lamp, the UV-C sensor immediately turns off but the ultraviolet sensor continues to fade slowly. Again! The UV-C Sensor only glows during the exposure!If you have one or more UV-C lamps, this card will reassure you that they are working properly. Two previous lamps that I purchased did not have any UV-C or even an ultraviolet component at all and this card immediately exposed them as phony. They were simple LED Corn lamps that put out blue light.