Measurement °C or ° F, %RH, AT, ppm(v) and Pressure Available Edgetech Instruments Model Dewtech 390 Comprises a Three Stage Peltier Cooled Mirror Hygrometer and Integral Refrigeration Unit Designed to Measure Moisture in Gas as Low as –90° C (-130° F) Dewpoint (Td) Model Dewtech 390 can display Concentration at Atmospheric Pressure or Compensate for Pressure Variations with Input from aPressure Transducer Accuracy to ± 0.2°C Dewpoint Bench or Counter Top Standing Front panel Access to All Main Components Including Mirror Cleaning Dual Alarm Capability. User Programmable, can be Set for Latching or Auto Reset Mode Serial and Analog Outputs RS232 Communication with Terminal, Printer or Computer Remote Programming Data Output such as Dew Point and Alarm Status 0-5 VDC, 4-20 mA, 0-10 VDC, or 0-20mA User Scalable to Drive Peripheral Devices. Available Simultaneously, One Input Per Measurement Parameter. Scalable Throughout the Entire Operating Range of Psychometric Variables, Program Via Front Panel Auto Balance Control 8 Line Graphic Display with Back Light