Alonefire SV62 Mini 3W UV Flashlight 365nm Portable Ultraviolet Black Light Very Small EDC for Minerals, Pet Urine Detector, Scorpions, Finding Stains, Money Detection with AAA Battery Easy to Replace

Or buy a UV mini-flashlight! It will save you popping in/out & it’s perfect for charging up solar reactive polishes like this. https://www.amazon.com/dp/B0BG9VT68Y?ref_=ppx_hzod_title_mob_b_fed_asin_title_0_0