... qualified products in production line DR series Digital Resistance Meter with auto judgement(0.01-100 Ohm) ... electrical ruler.3, Output:4 lines output,with various output mode selectable:UPPER/LOW or intevals ... analogue output: 0-10mA or 4-20mA,with output range adjusted by software.5, RS232 ... OR RS485 Modbus RTU protocol,connectable with various equipment,computer or PLC directly.6, Dimemsions ...