• Hygrometer using cooling to induce controlled condensation. The stable temperature at which this occurs is measured and reported as dew point or frost point.
• Usual format is a cooled mirror with optical detection of condensation used as feedback to control the mirror temperature.
• Calibrated condensation hygrometers are often used as references for calibration because they typically have good long-term stability and good resolution.

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• Humidity measurement
• Humidity basics
• Hygrometers
• Measuring humidity