... in production line DR series Digital Resistance Meter with auto judgement(0.01-100 Ohm) The principle: ... when indicated, with NG OK or HI LO GO output control,OK means auto reset,NG means ... used in eletronical production line for control of auto inspection, simple to operate, and practical.2, ... , RS232 OR RS485 Modbus RTU protocol,connectable with various equipment,computer or PLC directly.6, Dimemsions ...