... equipment for control of frequency,tacho,line-speed,level,etc;The instrument has ... ,please indicate when ordering.3, 4/5/6 digit display,with demical point switched automatically;Opical ... protocol,connectable with various equipment,computer or PLC directly.6, Width Power supply:regular: 80 ... , Counter, Tacho Meter, Frequency Meter, flowmeter,Timer,Timer Relay, Solid State Relay, Proximity Sensor, ,Pressure ...