The brand new Model 7899 Gas Sniffer is a portable, rugged and very easy-to-use leak detection tool ideal for any HVAC Professional. The 7899 is equipped with a highly sensitive tip to pinpoint small leaks of any combustible gases and hydrocarbons from piping and/or appliances (natural gas, methane, propane, butane, LPG, etc.). E Instruments International,, (215) 750-1212. Circle 252products