Review on Alonefire H42UV: High-Powered 36W 365nm USB Rechargeable UV Flashlight - Ideal for Pet Urine Detection, Resin Curing, Fishing, and Scorpion Hunting with UV Protective Glasses and 4xLithium Battery by Kristen Davis

At the time of this review, this is probably the best UV flashlight widely available. Very thoughtful design and very well built with super performance. It produces true UV at 365nm with very little visible light. Reactive objects are detected even from 50 feet away. The ability to charge is handy, but unlike some smaller designs, the batteries can still be removed for external charging. 4 batteries included are original, good quality, full capacity, 18650 batteries, no worse than fakes. This is a great quality lamp that is hard to beat at this price point.