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Mikroe Ammonia Click is based on the MQ-137 gas sensor with a sensitive layer made of SnO2, which changes its resistance when exposed to ammonia. The sensor can sense NH3 concentration in the range of 5ppm to 200ppm. The board is equipped with a trimmer potentiometer. It adjusts the sensitivity and offset of the MQ-137 sensor, making it ideal for the detection of ammonia.