Air Conditioning Refrigerant Halogen Freon Leak Check Detector Detects all halogenated refrigerants. Real time sensitivity adjustment to the maximum level. With high-precise stablilized voltage IC. The super-low power supply circuit design enables stability and long usage of batteries. Adopt high-quality sensor with high-sensitivity and long usage. Detect leaks in air-conditionings, freezing systems and so on. It will respond to ALL halogenated (contains Chlorine of Fluorine) refrigerants. Maximum sensitivity: 0.2 oz/yr ( 6g/yr ) for all halogen refrigerants. Response time: Instantaneous. Reset time: 2 to 10 seconds. Warm-up time: approximately 6 seconds Working Mode: Continuous, no limitation. Operating temperature: 0C to 52C (30F t 125F) Power supply: 6V DC, Four-cell AAA batteries (Not include). Probe length: 8"