Pressure Indicator : Accepts 4-20mA from pressure transmitter & displays pressure.Pressure Controller : Accepts 4-20mA from pressure transmitter, displays pressure and gives a relay op.3-12" Digit LED Display4 IP 4-20 mA4 Works on 230V AC Mains4 Generates 24V DC supply4 Displays pressure upto 1000 bar4 Single relay or Double relay op (Controller Only)