... to sensor for pressure,Loadcell,switch,etc. DS3A series 4 Digits display Sensor Meter1) Signal input: regular:4-20mA/0 ... up to 2 alarm output4) big inch LED 4 digit display,range:-1999~9999 floating point; 5) Communication:RS232 OR RS485 Modbus RTU protocol.6 ... , Ampere Meter, Counter, Tacho Meter, Frequency Meter, flowmeter,Timer,Timer Relay, Solid State Relay, Proximity Sensor, ,Pressure sensor ,load ...