Features: 1¡¢Smart Testing: High in sensitivity and wide in response range, the detector enables reliable testing on the gas leakage of pipeline. 2¡¢Reliable Work: Can be applied to detect acetone, acetylene, hydrogen, benzene, butane, ethanol, ethylene oxide, gasoline and so on. 3¡¢Clear Display: The gas tester with highly accurate digital display allows for a clear viewing on the result, very easy to operate. 4¡¢Dual Alarming: With dual alarm of colourful display and sound buzzer, the propane sensor will build you a safe working environment. 5¡¢Easy Carrying: Designed to have a light weight and a compact size as well, the easy carrying will simplify indoor and outdoor using. Item Type: Gas Detector Model: HT66 Material: ABS Battery: 2 x 1.5V AAA battery, without battery. Application: Widely used in chemical industry, environmental protection, mining, scientific research, animal husbandry, catering and other industries. Sensor: Gas Sensitive Semiconductor Response Range: About 50PPM~1000PPM for methane. Sensitivity: About 500PPM: About 2 Seconds Alarm Mode: Buzzer and indicator light. 1 x Gas Detector 1 x User Manual