Marketing InformationBlue MonsterĀ® Microbubble leak detector is a sensitive solution formulated to detect even the smallest of leaks in air and gas lines, tanks, cylinders, valves, fittings, pipelines and other suspect areas. Blue Monster's dependable formula provides long-lasting leak detection up to 10 min after application. Ideal for identifying leaks in refrigeration and air conditioning systems, this easy-to-use leak detector is equally effective on natural gas, propane, butane, air, nitrogen, chlorine, CO2 and most other gases. Not for use on oxygen systems.