Digital RPM Tachometer Work with encoder/switch/other signals ... HZ,line speed,level 4/5/6 digit display. Digital RPM Tacho meter/ Techometer (FA) Usage: Applications with control equipments ... Temperature Controller, Digital Adjustor,thermocouple (TC and RTD), Panel Meter, Sensor Meter, inductor, Power Meter, Coulometer, Voltage Meter, Ampere Meter, Counter, Tacho Meter, Frequency Meter, flowmeter, ...