... in production line DR series Digital Resistance Meter with auto judgement(0.01-100 Ohm) The principle ... Meter 0-500M can be built when indicated, with NG OK or HI LO GO output control,OK ... as electrical ruler.3, Output:4 lines output,with various output mode selectable:UPPER/LOW or intevals ... .5, RS232 OR RS485 Modbus RTU protocol,connectable with various equipment,computer or PLC directly.6, Dimemsions: ...