model: fi series frequency / speed / line speed meter
two output control modes are available: upper limit alarm (u) and lower limit alarm (d);
have a hysteresis setting to improve the stability of the instrument and system work;
select 4-20ma transmission output and rs485 communication interface;
high measurement accuracy, optional fixed point or floating display;
multi-purpose instrument: it can be used as frequency meter, line speed meter and tachometer respectively through software selection.