Quick Overview 

1. Wide detecting scope
2. Fast response (less than 1s)
3. High sensitivity( 3%)
4. the circuit voltage: DC5V
5. Stable and long life
6. Operating Voltage is +5V
7. Detect/Measure NH3, Ammonia

Product Description 

       The MQ137 sensor is a gas sensor module is specially designed to detect and sense gases like ammonia (NH3) and carbon monoxide (CO). The MQ137 gas sensor module comes with digital pins that can be connected to a microcontroller like Arduino boards and come in handy when you are only trying to detect one particular gas.