Digital Panel Meter, Pressure, Input Range 0.25 to 0 to 0.25 In WC, Display Span 9999, Display Digits Selectable, Display 4 Digit LCD, Relays 2 SPDT, Fits 4 1/2 In Round Cut Out, Connector Type Compression Fitting, Process Connection 1/8 In ID Tubing, Power Required 12 to 24 V AC/DC, Interface RS-485, Output 4 to 20 mA DC, NEMA Rating 4X Face, Depth 3 1/8, Mounting Front Ring, Includes Instructions