Reliability and Performance

Optimizing the chilled mirror principle, the Duet’s precision engineering and advanced measurement algorithms deliver accurate, direct humidity measurements, including dew point, frost point, %rh, ppm, ambient temperature and pressure.



FrostLock ensures a known condensate state – either frost or super-cooled dew – at mirror temperatures below 0 °C, eliminating mixed or ambiguous conditions. This harmonious precision in dew-frost detection resolves longstanding industry misconceptions, ensuring accurate calculation of dependent humidity values.



ARIA minimizes the time required for low frost-point measurement by rapidly depositing a controlled condensate layer on the mirror, ensuring sufficient thickness for reliable frost-point detection.



Dual Mirror PRTs

The Duet is equipped with two independent, 100 ohm, 4-wire, mirror PRTs for precise mirror temperature measurement. The second PRT enables direct temperature monitoring using your own resistance bridge or our optional PT12 Precision Thermometer.



Verifiable Calibration

Using the known 0 °C ice-melt temperature, the built-in IceTest function instantly confirms system accuracy and integrity.



Robust Connectivity

Versatile communication interfaces include RS-232, TCP/IP and USB. Use the included RHS Control software for real-time control and data acquisition, or develop custom software using our straightforward, fully documented command protocol.



Feature Complete

Every Duet comes fully equipped with an integrated pump, flow meter, pressure sensor and external temperature probe, ready for immediate operation.