... NPN) 4/6/8 digits display. 6 digits Multimeter for Height/Position/Length/Counting Features: 1, Various wave form pulse input ... line of machinery,food,package,etc for measuring not only height,location,length,counting,etc.,but also frequency,speed,counting at ... to 3 segments output with output control mode set freely.4, Display:6 digits display,sensor power supply 12V/24V/30mA available ...