Hand Tools

MQ137 Gas Sensor Module MQ-137 Ammonia Sensor Module NH3 Sensor Module Description: Size: 32mm X22mm X30mm length * width * height Main chip: LM393, NH3 gas sensing probe Working voltage: DC 5V Features: 1. It has a... MQ137 Gas Sensor Module MQ-137 Ammonia Sensor Module NH3 Sensor Module