... and monitoring system for spacing,positioning detection,auto counting,speed and auto protection for production line,serial signal, ... Ouput:NPN,PNP(normal open or normal closed,current:100--300mA),relay,logicgate,etc,movement distance within 5cm--10m selectable. ... Counter, Tacho Meter, Frequency Meter, flowmeter,Timer,Timer Relay, Solid State Relay, Proximity Sensor, ,Pressure sensor ,load cell sensor, ...