1This MH - Z19 C02 gas sensor has high sensitivity, high resolution 2Providing a variety of forms output modes, such as UART and PWM wave 3Anti-water vapor interference, no poisoning 4With temperature compensation, excellent linear output 5Low power consumption, good stability and long lifespan Descriptions: MH - Z19 C02 gas sensor is a common type, small sensors, using the non-dispersive infrared (NDIR) principle to detection of our fleet in the air, has good selectivity, no oxygen dependence, long life, built-in temperature compensation: lotus digital output and waveform output at the same time, easy to use. The sensor is a high performance sensor which combines mature infrared absorption gas detection technology with precision light path design and sophisticated circuit design. Features:This MH - Z19 C02 gas sensor has high sensitivity, high resolution.Providing a variety of forms output modes, such as UART and PWM wave.Anti-water vapor interference, no poisoning.With temperature compensation, excellent linear output.Low power consumption, good stability and long lifespan.It is widely used in the HVAC refrigeration and indoor air quality monitoring.Specifications:Product model: MH-Z19BDetection of gases: C02Working voltage: 3.6V-5.5 V DCAverage current: