The Arctic Hayes Gas Leak Detector will identify the presence of combustible gases such as natural gas, methane, propane, butane and ammonia in appliances, valves, pipes and fittings. As the sensor interacts with gases, the unit immediately indicates to the user that combustible gases are present, which helps to quickly locate the source of a leak. When the presence of gas is detected, the unit will indicate by illuminating the LEDs on the front of the detector and raising an audible alarm. Conforms to EMC and RoHS directive, CE and UKCA complaint. Specification: Detects Between: 50ppm to 1000ppm Operating Conditions: 0°C to +50°C / -32°F to 122°F to 80% RH Power: 2 x 1.5V AAA alkaline battery (supplied)