Rechargeable, the OPTI-LUX™ 400 is an LED leak detection flashlight. It features a high-output, violet light LED that causes dyes to fluoresce more brilliantly and with greater contrast, said the company. It works with all popular universal/POE dyes. The leak detection flashlight’s inspection range is up to 25 feet (7.6 meters) or more. A rugged, corrosion-resistant, anodized lamp body stands up to years of heavy use, said the manufacturer. Powered by one rechargeable lithium-ion battery, the flashlight provides four hours of continuous inspection between charges. The unit has a 100,000-hour LED service life. The flashlight comes complete with a lanyard, rechargeable battery, charging cradle, ac and dc cord sets, and fluorescence-enhancing glasses.