Features:
It is small but has many functions, easy to operate & carry.
It can be used with oscilloscope to test & debug electronic circuit, the frequency response of audio amplifier & impulse response.
The square waveform is suitable for oscilloscope attenuator & the adjustment of probe impulse response.
It also can calibrate the sweep time factor of oscilloscope.
Have a filter (can be opened & closed) to suit the output of sine wave & pulse wave.