These compressed air dewpoint monitors are designed to offer the highest level of reliability and accuracy available in such systems. They are NIST traceable and employ a chilled mirror sensor, an accurate dewpoint-sensing scheme that delivers consistent drift-free measurements without regular calibrations or sensor replacement. The ruggedized aluminum NEMA 12 (IP55) enclosure houses the sensor, control circuitry (including flow control), and is easily wall-mountable to conserve space. Also, the units offer a programmable automatic balance control cycle that corrects for the light-reducing effects of mirror contaminates.