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The Optidew Dewpoint Hygrometer uses fundamental optical dewpoint measurement to provide drift-free long-term performance. It offers a wide measurement range of -76 to +194°F dewpoint (or 0.5 to 100% relative humidity) at temperatures from -40 to +194°F. Optidew provides two linear 4 - 20 mA outputs in addition to serial communication, allowing set-up and monitoring by a suitable computer or PLC system or via Optidew's own logging software. An adjustable dry alarm contact means that Optidew can be used for direct process control.