... 1.Material, hardness sorting etc. 2.Digital and wave display 3.Mass storage 4.8 frequency Eddy Current Metal Material ... instrument adopts Fourier transformation method to analyze the signal in real time, calculate and restore the main frequency and high times ... modes. Automatic calendar and time showing.Real-time display F1, F2, F3, F4, F5, F6 or F7 impedance plane figure.Real-time display F1, F3, F5, ...