... pieces.2.This instrument can choose, analyze the main frequency of the signal or 2,3,4,5,6,7 times harmonic ... the general eddy current instrument that only inspect the main frequency of signal.Technical ParametersFrequency range: 5Hz~500KHz.Encourage waveform: sine wave ... impedance plane figure.Real-time display F1, F3, F5, F7 frequency spectrum diagram.Set the selectivity of 60.00%~99.99% (adjustable ...