Multifunctional CO meter: This is a mobile 3-in-1 combined CO, temperature and humidity meter. It can measure not only CO concentration, but also temperature and humidity. The measured values are updated every two seconds, which is significantly more common than conventional CO detectors and can inform you about the CO concentration in near real time. Compact and portable: This mini CO detector is very compact and portable and can also be used as a handy thermometer or hygrometer. It is very suitable for use when traveling or camping with a tent, in the car, in the camper, in houses with a fireplace or in factories with combustion plants where carbon monoxide poisoning can occur. Electrochemical gas sensor: This mini CO detector uses the principle of electrochemical reaction to measure CO concentration quickly and accurately. The built-in electrochemical carbon monoxide sensor has an h