Buruan dibeli gan....barang murah-berkualitas SIAPA CEPAT DIA DAPAT Spesifikasi: Air Quality Sensor Module Condition: New Size: 32mm X 22mm X 27mm Main chip: MQ-135 Working voltage: 5 VDC output signal : TTL low level Analog 0 ~ 5 v voltage output, the higher the concentration, the higher the voltage