Ammonia (NH3) monitors is a microprocessor-based analyzer. It is used as an ammonia ion-selective probe. This compact, self-contained analyzer provides effective measurements of ammonia in sewage treatment, rivers, potable water treatment, boiler feed water and industrial effluents. It is a ammonia measurement device. It achieves better than 1 ppb detection of ammonia in ambient air. It advances detection limit and measurement speed to enable real-time monitoring of airborne ammonia in lithography areas.