... pulse,contact switch,encoder(PNP or NPN) 4/6/8 digits display. 6 digits Multimeter for Height/Position/Length/Counting Features: 1 ... , Various wave form pulse input,contact switch,encoder(NPN PNP) to used with ... etc for measuring not only height,location,length,counting,etc.,but also frequency,speed,counting at the same time.2, Accuracy:0 ...