BIRD DOG – is the most sensitive leak detector in the industry and is the ideal solution for pinpointing leaks. Its bubbles last up to 20 times longer than other leading brands, (longer than one hour in most cases). Bird Dog’s formula is perfect for detecting micro and macro leaks. The most sensitive leak detector in the industry is also available in low temp. It is non-toxic and biodegradable. Suitable for all types of refrigerant, nitrogen, natural gas, oxygen and A2L systems. For use down to 32°F