... frequency meter, tachometer, line speed meter 1)2 relay output tachometer 2)5 digit LED display frequency meter Digital frequency meter, tacho meter, line speed meterToky FM series Frequency / Tacho / Linspeed Meter ... d-U, d-d;4) One meter with multi-function, frequency / tacho / line speed selected by ... 6) With hysteresis setting to improve the stability of meter and system;7) High accuracy, 0.1 ...