Gas leak detector. Sensitive solution formulated to detect even the smallest of leaks in air and gas lines, tanks, cylinders, valves, fittings, pipelines, and other suspect areas. Detects leaks for up to 10 minutes. Non-freezing formula, usable from -10 Deg (degrees) F (Fahrenheit)/-23 Deg C (Celsius) to 215 Deg F/101 Deg C. Will not cause corrosion or deterioration of metal or plastic piping systems. Ideal for testing pressure less than 1 PSI (pounds per square inch).