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Norm-Frechette posted on r/flytying1d
i use this one from walmart https://www.walmart.com/ip/Lepro-UV-Black-Light-Flashlight-with-Batteries-21-LEDs-UV-Light-Handheld-Blacklight-395nm-Detector-for-Pet-Urine/211112326?wmlspartner=wlpa&selectedSellerId=8515&selectedOfferId=A0756FE3CEF84028B9AE6EE43950C455&conditionGroupCode=1