There is a postcard. The card says there is a tester in the package. but there is no light. No tester. The actual blue light (not what you have around the house) has to be purchased separately. So I did. For $5.95 I get a new test card and a blue lightbulb so I can actually test: https://www.amazon.com/gp/product/B078ZDL58H. If you don't have a blue lightbulb handy, use your cash to get what you need. for blue light testing, not just maps.
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