Model DS1200-AMP FEATURES: User Friendly Advanced Functionality DISPLAY in C Dewpoint F Dewpoint, ppm(v), ppb(v),g/m3 or lbs/MMSCF 22V 253V AC or DC Operation Linear 4-20mA Retransmission Signal 2 Independent, Fully Programmable Alarm Relays AUTOCAL CALIBRATION FEATURE Fast Response Long Term Stability IP66 / NEMA4 Weatherproof Protection Calibration to National International Standards