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Product description:Sensitive material of MQ-9 gas sensor is SnO2, which with lower conductivity in clean air. It makedetection by method of cycle high and low temperature, and detect CO when low temperature (heatedby 1.5V). The sensor’s conductivity is more higher along with the gas concentration r..

The MQ7 is a simple-to-use Carbon Monoxide (CO) sensor suitable for sensing CO concentrations in the air. It can detect CO-gas concentrations anywhere from 20 to 2000ppm. MQ7 is a high sensitivity to carbon monoxide and stable and long-life span.FeaturesFast response and High sensitivity.Stable and ..