We are looking for a oscilloscope, which could display the fundamental component of the given complex waveform. It's like even if you give a square wave it shd display a sinusoidal waveform having an amplitude and frequency of that of the fundamental component of the square waveform. Kindly suggest a suitable oscilloscope for that.
Do you need to see the sine wave in the time domain? Or is amplitude and frequency what you want to know? If so, a FFT function could be what you want in the scope.