... measurement of RPM,HZ,line speed,level 4/5/6 digit display. Digital RPM Tacho meter/ Techometer (FA) Usage: Applications ... 0.01Hz. Display digit & modes: 4 digit display( 5/ 6 digit for option), display modes settable:Frequency, Line-speed, Tacho ... thousands of different models of products, including Temperature Controller, Digital Adjustor,thermocouple (TC and RTD), Panel Meter, Sensor Meter ...