... alarm Measure methane, oxygen, CO, sulfured hydrogen, temperature and humidity Hand held, portable Multi-parameter Detecting Alarm is a new ... such as methane, oxygen, carbon monoxide, sulfured hydrogen, temperature, and humidity. Main specificationsItemSpecificationDisplay modeLCDSound & light alarmIntermittent sound & light alarmPower supplyDC3. ... (-20~80)±1 Deg C'0.1 Deg C'Humidity(0~100)%RH±3%RH1RH