Multifunctional CO MeterThis is a 3-in-1 portable device that combines carbon monoxide, temperature and humidity. It can not only measure CO concentration, but also air temperature and humidity. The measured values are updated updated every two seconds, which is much more frequent than traditional CO detectors and allows you to know the CO concentration almost in real time. Compact and PortableThis mini CO detector is very compact and portable, and can also be used as a thermometer or hygrometer. It is very suitable for traveling or camping in a tent, in cars, RVs, homes with stoves or factories with ovens, where carbon monoxide poisoning may occur. Electrochemical Gas SensorThis mini CO detector uses the principle of electrochemical reaction to quickly and accurately measure the CO concentration. The built-in electrochemical carbon monoxide sensor has high measurement accuracy, good anti-interference ability and long service life. It is certified to meet the European standard EN-50291 for carbon monoxide detectors and has high reliability.