... RPM,HZ,line speed,level 4/5/6 digit display. Digital RPM Tacho meter/ Techometer (FA) Usage: Applications with ... Input: various waveform pulse(square wave,triangle wave,proximity switch,photo switch or AC voltage)volt signal, contact switch, encoder ... thousands of different models of products, including Temperature Controller, Digital Adjustor,thermocouple (TC and RTD), Panel Meter, Sensor Meter ...