The Gas Mate is an ATEX approved combustible leak detector that uses leading-edge technology to detect hydrocarbons and other gases with twice the sensitivity of competing models. Perfect for checking leaks in residential and commercial combustion appliances, such as natural gas- or propane-fired heating systems, or gas pipelines. Suitable for R32, R134YF/ZE, R600A Features: Sensitive to 500ppm of Hydrogen (Trace-A-Gas). Sensitive to 5 ppm methane (twice as sensitive as the nearest competitor) Also detects natural gas, propane, butane, cyclopentane, ethane, ethanol, isobutane and ammonia Multiple LEDs, variable intensity audio alarm indicate leak strength Adjustable sensitivity helps pinpoint leaks fast Auto-zeroing for ignoring background gas levels in leak test area Small sensor and probe tip permit leak checking in tighter places Certified intrinsically safe by MET Laboratories for use in combustive/explosive environments 3-year replacement warranty