PART NUMBER: 500A0300AAPPLICATION:Detects Natural Gas, Methane, Propane, Hydrogen and Butane Locates leaks in pipes, valves, fittings and tanks Operates up to 8 hours on 2 AA alkaline batteries Highly sensitive solid state sensor Eye-catching emergency yellow housing Only 6" long, fits easily into pocket or tool-belt Has both audible and visual alarm indicators Factory calibrated to 5000 ppm (0.5%) methane in air (equivalent to approx. 2000 ppm Propane)FREE SHIPPING TO THE 48 STATESWe have thousands of parts in stock, if you do not see the part you need!Feel free to ask us about conversion kits for almost anything including trucks, cars, generators, tractors, boats, motorcycles, RVs etc. We can build a kit to convert almost any engine!. WARNING: This product can expose you to chemicals including lead and lead compounds, which are known to the state of California to cause cancer. www.P65Warnings.ca.gov. WARNING: These products contain a chemical known to the state of California to cause cancer and birth defects or reproductive harm. www.P65Warnings.ca.gov.