The Tracer Products TRALF500CS LeakFinder UV Lamp with three AAA batteries is a handheld lamp that can be used to find leaks in water, oil, gas, and other fluid systems The lamp has a built-in UV light that can help identify leaks and other problems in water, oil, gas, and other fluid systems The lamp has a battery life of up to 50 hours, and it comes with a carrying case and three AAA batteries