Streamlight Stylus Pro USB Rechargeable UV Penlight Black 400nm STL66149

Some problems hide where the eye cannot see. A tiny refrigerant leak is escaping through an AC line. A forged document that looks genuine under normal light. A fine crack in a piece of machinery that could halt production if left undetected. These are the kinds of hidden issues that cost time, money, and trust. For professionals who can’t afford to overlook the details, the Streamlight Stylus Pro USB Rechargeable UV Penlight is more than a tool—it’s an advantage. Compact, reliable, and designed to reveal the unseen, it gives you clarity where it matters most.

Built on Streamlight’s proven Stylus Pro platform, this penlight integrates a powerful ultraviolet output with the convenience of USB rechargeability. Its 400nm UV LED delivers a measured system output of 250 mW, making it ideal for detecting engine and HVAC leaks, authenticating documents, or conducting forensic inspections. With a runtime of up to 2.5 hours, it ensures you have the working light you need for demanding tasks. When it’s time to recharge, the lithium-ion battery is back to full power in just 2.5 hours using the included USB cord. A charge indicator system keeps you informed, glowing red during charging and green when the penlight is ready.

Durability is built into every detail. The Stylus Pro USB UV is crafted from machined aluminum with a MIL-Spec Type II anodized finish and features a gasket-sealed glass lens for dependable use in tough environments. Its unique purple sliding sleeve protects the USB port while adding a clear distinction from standard white-light models. Rated IPX4 water-resistant and impact tested to one meter, this penlight is ready for field conditions without compromise. The push-button tail switch makes operation simple, whether you need momentary or constant-on UV light. With a length of just under six inches and weighing only 1.8 ounces, it slips easily into a pocket, holster, or tool bag without adding bulk.

For the automotive or HVAC technician, the Stylus Pro USB UV instantly exposes fluorescent dyes in cooling and fluid systems, eliminating guesswork and wasted hours. For security professionals and investigators, it offers fast, reliable document authentication and the ability to reveal evidence invisible under normal light. For industrial inspectors, it’s a precise, non-destructive way to locate cracks and flaws before they escalate into major failures.

When the smallest details mean the difference between solving a problem or overlooking it, the Streamlight Stylus Pro USB UV ensures nothing stays hidden. Get yours today at SMKW, the best online knife and gear store, and put the power of ultraviolet inspection in your pocket.