Testing a UV/UVC test card

I'm not sure how widely these were available before the pandemic, but they're now all over eBay due to the market that was created for testing germicidal wands and lights.

One very useful function of these it to test the ability of materials to block UVC light. By placing the test material (like my glasses) between the UVC source and the sensing surface it will indicate if the UVC is blocked. In my case all my glasses blocked UVC, which is reassuring.

The UVA test surface seems to respond right down to the near-UV LEDs in the 395-405nm range.

To find these on eBay use the keywords - UVC test card.
Price should be around 5 £$€ for a pack of 5 and not much more for a pack of 10.

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