A single channel inline hygrometer, AcuTrak, designed for the measurement of trace moisture in process gases and dry compressed air. This hygrometer is suitable for integration with the AcuDew dewpoint transmitter and features a 4-20 mA analogue output signal and RS485 digital communications. Connection and configuration of the AcuTrak hygrometer and the AcuDew dewpoint transmitter is a simple installation process. This pairing maintains signal integrity from sample point to control system without loss of signal.