... measure range settable: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) Power supply ... Power:regualr:220V/110V or 90~265V AC/DC,12~30V ... Digital Adjustor,thermocouple (TC and RTD), Panel Meter, Sensor Meter, inductor, Power Meter, Coulometer, Voltage Meter, Ampere Meter, Counter, Tacho Meter, Frequency Meter ...