{"product_id":"395nm-uv-blacklight-flashlight-usb-rechargeable-waterproof","title":"395nm UV Blacklight Flashlight | USB Rechargeable, Waterproof","description":"\n\u003ch2\u003eESMARTER 395nm UV Blacklight Flashlight – Rechargeable \u0026amp; Waterproof\u003c\/h2\u003e\n\u003cp\u003eIlluminate what the naked eye can't see with the \u003cstrong\u003eESMARTER K31 395nm UV Blacklight Flashlight\u003c\/strong\u003e. Whether you're tracking down hidden pet stains, curing UV resin, checking fluorescent markings, or verifying currency authenticity, this compact and powerful ultraviolet torch delivers a bright \u003cstrong\u003e250-lumen output\u003c\/strong\u003e across a \u003cstrong\u003e50–100 metre range\u003c\/strong\u003e — all from a sleek, rechargeable aluminum alloy body.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e395nm Ultraviolet Wavelength:\u003c\/strong\u003e The ideal UV frequency for detecting pet urine stains, curing UV resin, authenticating documents, and revealing fluorescent residues invisible under normal light.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePowerful 250-Lumen Output:\u003c\/strong\u003e A high-output 10W LED delivers strong, even UV illumination with an effective range of 50–100 metres.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUSB Rechargeable – Battery Included:\u003c\/strong\u003e Built-in rechargeable battery charges conveniently via USB — no more hunting for replacement batteries. Simply plug in and recharge.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWaterproof Construction:\u003c\/strong\u003e Rated waterproof for confident use outdoors in wet or unpredictable weather conditions.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurable Aluminum Alloy Body:\u003c\/strong\u003e Lightweight yet rugged, the aircraft-grade aluminum alloy housing resists everyday wear, drops, and corrosion for long-lasting performance.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCE \u0026amp; RoHS Certified:\u003c\/strong\u003e Meets European safety and environmental compliance standards for peace of mind.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact \u0026amp; Portable:\u003c\/strong\u003e Slim, pocket-friendly design makes it easy to carry for home use, travel, outdoor adventures, and professional tasks.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePerfect For\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e🐾 \u003cstrong\u003ePet Urine \u0026amp; Stain Detection\u003c\/strong\u003e – Quickly locate hidden pet accidents on carpets, upholstery, and hard floors.\u003c\/li\u003e\n  \u003cli\u003e🔧 \u003cstrong\u003eUV Resin Curing\u003c\/strong\u003e – Efficiently cure UV-reactive resins for crafts, jewelry, and repairs.\u003c\/li\u003e\n  \u003cli\u003e💵 \u003cstrong\u003eCurrency \u0026amp; Document Authentication\u003c\/strong\u003e – Verify security markings on banknotes and official documents.\u003c\/li\u003e\n  \u003cli\u003e🔍 \u003cstrong\u003eFluorescent Dye Tracing\u003c\/strong\u003e – Trace leaks and check for contamination in HVAC and plumbing systems.\u003c\/li\u003e\n  \u003cli\u003e🎨 \u003cstrong\u003eCraft \u0026amp; Art Projects\u003c\/strong\u003e – Ideal for UV-reactive paint, glow-in-the-dark effects, and art installations.\u003c\/li\u003e\n  \u003cli\u003e🏕️ \u003cstrong\u003eOutdoor \u0026amp; Camping\u003c\/strong\u003e – Reliable waterproof torch for nighttime outdoor activities.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eK31\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eUV Wavelength\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e395nm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLumen Output\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e250 lm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWattage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e10W\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLighting Distance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e50–100 metres\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBody Material\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAluminum Alloy\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCharging\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSB Rechargeable (Battery Included)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWaterproof\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCertifications\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCE, RoHS\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade in China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/0-25mm-1000-turn-precision-copper-inductor-coil-diy-electronics\"\u003e0.25mm 1000-Turn Precision Copper Inductor Coil for DIY Circuits\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/038-inch-1280x720p-micro-display-diy-hdmi-driver-board-kit\"\u003e0.38\" 1280x720P Micro Display DIY Kit with HDMI Driver Board\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1-channel-relay-module-dc-3-3v-24v-optocoupler-arduino\"\u003e1-Channel Relay Module DC 3.3V–24V Optocoupler for Arduino\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor more information on UV light safety and best practices, visit the \u003ca href=\"https:\/\/www.fda.gov\/radiation-emitting-products\/tanning\/ultraviolet-uv-radiation\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eFDA's guide on Ultraviolet (UV) Radiation\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What wavelength does this UV flashlight emit, and why does it matter?\u003c\/h4\u003e\n\u003cp\u003eA: This UV flashlight emits light at \u003cstrong\u003e395nm\u003c\/strong\u003e, which sits at the near-UV\/visible-light boundary. This wavelength is highly effective for causing fluorescent substances — such as pet urine, adhesives, and security markings — to glow visibly, while being safe for general handling use. It is also the recommended wavelength for curing many UV-reactive resins.\u003c\/p\u003e\n\n\u003ch4\u003eQ: How do I charge the ESMARTER K31 UV flashlight?\u003c\/h4\u003e\n\u003cp\u003eA: The K31 features a built-in rechargeable battery that charges via a standard USB cable (included). Simply connect it to any USB power source — a computer port, wall adapter, or power bank — and it will be ready to use once fully charged. No proprietary charger or replacement batteries are required.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Is this UV flashlight safe to use around pets and children?\u003c\/h4\u003e\n\u003cp\u003eA: While 395nm UV light is at the lower end of the UV spectrum and far less intense than direct sunlight UV exposure, it is still advisable to avoid shining it directly into eyes. When used responsibly for scanning surfaces such as floors, carpets, or workbenches, it is safe for household use. Always direct the beam away from people and pets' faces.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Can this flashlight be used outdoors in wet conditions?\u003c\/h4\u003e\n\u003cp\u003eA: Yes! The ESMARTER K31 features a \u003cstrong\u003ewaterproof design\u003c\/strong\u003e, making it well suited for outdoor use in rain or damp environments — perfect for garden inspections, camping trips, and outdoor property checks.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What wavelength does this UV flashlight emit, and why does it matter?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This UV flashlight emits light at 395nm, which sits at the near-UV\/visible-light boundary. This wavelength is highly effective for causing fluorescent substances — such as pet urine, adhesives, and security markings — to glow visibly, while being safe for general handling use. It is also the recommended wavelength for curing many UV-reactive resins.\"}}, {\"@type\": \"Question\", \"name\": \"How do I charge the ESMARTER K31 UV flashlight?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The K31 features a built-in rechargeable battery that charges via a standard USB cable (included). Simply connect it to any USB power source — a computer port, wall adapter, or power bank — and it will be ready to use once fully charged. 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