The S8000 -100 hygrometer directly measures the formation of condensation on a mirrored surface, offering the widest possible measurement range of -100…+20 °C frost/dew point. It uses a unique advanced dual optics system which detects small changes in moisture condensed on the mirror surface. This results in a very high sensitivity and fast response to changes in frost point, even at very low moisture levels where measurements are most challenging. Fully automated control of the system means that no operator intervention is required. The instrument provides a range of Modbus digital communications, and analog outputs allowing it to be monitored remotely or via specific S8000 -100 logging software. 4-wire Pt100 connections are provided on the rear panel for remote mirror temperature monitoring. A high-contrast touch-screen LCD display gives or presents entirely customizable local indication of the measured values, along with a trend graph and fault warnings.