uvc dosimeter Cards, uvc Light Test Cards, 100 pcs Single-use uv Card, UVGI Dosage Indicator, uvc Dosage Monitor for uv-c Light, Verify All uvc Light, 253.7nm uvc Detector, uvc Result Visibility

I use UV for disinfecting. I keep small UV sterilizers in my TEOTWAWKI supply. Idea for checking them.

Only after using the cards for a couple months did I notice the product insert said these expired in June 2022. I ordered them in October 2022. So, I'd be very hesitant to order these as they may be expired.

So these work great. We did a quick validation using some known sources and a very expensive dosimeter to validate the measurements. These cards are as accurate as you could get with a color reading, and easy to use.Best part is that they are foil sealed in 10 packs of 10 cards each. This ensures that you dont pre-expose cards to uv by accident while storing.I strongly suggest anyone buy these to test their UV disinfection devices. So many of those just emmit UVA or UVB reducing effectiveness often to near zero. But a user cant tell without a either a biolab or one of these nifty cards.(((as a personal aside these cards are great for validating disinfection capacity of UV sterilization bulbs for fish tanks / aquariums. The bulbs wear out over time and need replacement as they are on 24/7. My Cichlid tank appreciates knowing my bulb is down to half effectiveness.)))

Item returned because they were out of date.

SAFELY applying UV-C Germicidal light for disinfection requires diligence and expertise. Safety hazards both from exposure to the UV-C radiation, as well as, applying sufficient dosage to actually neutralize the target pathogens. If used knowledgeably, Dosimeter cards CAN provide an INDICATION of how much an area was irradiated. SAFE application requires that one MUST understand germicidal disinfection and verification techniques. Ok. If you don't know, find out--assumptions can be deadly.SUNLIGHT UV-C is filtered by the atmosphere Ozone layer - the 'natural' UVA/UVB emitted by the sun WILL CAUSE A COLOR CHANGE. NOTE the UV-C radiometer reading 0.00 in the SUNLIGHT while the card has colored in ~5 min sunlight exposure. Consequently, I would NOT use these dosimeters to verify UV-C versus UVA/UVB.QUALITATIVE test to see these dosimeters react to UVC (254 nm). YES THEY DID -- the pictures that show center-dot color changes at 1 min, 5 min and 10 min exposure to 254 nm light from a Philips 265850 36-watt PL-L TUV Germicidal Light Bulb. A radiometer used to verify the 254 nm UVC wavelength - UV Radiometer 7.1, GUVC-T10GS7.1-LA9 -- UVC Range : 220~280nm.The dosimeter card has color graduations a levels measuring mW/cm2 - a standard unit. I made no attempt to verify the 6 color segments with the posted mW/cm2 dosage, ONLY that they react to exposure to UV-C -- one should conduct their own dosage verification for their application.

Affordable and effective! Goodbye expensive Dosimeter cards!

Seems to do the job well. I keep using them and let them get darker.

The cards are easy to use and distinctly show how much uvc exposure rather than just the confirmation of uvc exposure.