... is optical isolated 2.Can be with analogue output FT8 Series Digital Tachometer FEATURES:1). One meter with multi-function, ... tachometer, line speed meter selected by software2). Dual display line, 4, 6 digit LED display3). High accuracy, decimal point can be set ... ≤Low level ≤2VInput impedance≥10KΩMeasuring range0.1 ~ 5000Hz (Frequency), 6 ~ 99999R/min (Tachometer)Measuring accuracy0.2%F.S ± 2 Digit ...