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MQ 135 Air Quality/Gas Detector Sensor Module For ArduinoFeatures-Sensitivity to Ammonia, Sulphide, and Benzene steamWith signal output instructionsThe TTL output signal is a low levelAnalog 0 ~ 5 v voltage output, the higher the concentration, the higher the voltageColor is showing pictures...

MQ-7 CO Carbon Monoxide Coal Gas Sensor ModuleFeatures-The analog output voltage, the higher the concentration the higher the voltage.The carbon monoxide detection with better sensitivity.There are four screw holes for easy positioning.With a long service life and reliable stability.Rapid response a..

MQ-9 Carbon Monoxide, Methane, and LPG Gas Sensor ModuleFeatures-Good sensitivity to CO/Combustible GasHigh sensitivity to Methane, Propane, and COLong life and low costSimple drive circuit..

HR 202 Humidity Detection Sensor ModuleFeatures-Adjustable Sensitivity, External GND.Detect Ambient Humidity.Provided with Fixed Bolt Hole, Convenient to Install.Power Indicator Light & Digital Output Indication Lamp.Using LM393 Chip for Stable Work.DO Small Digital Outputs Interface (0 & 1)..