An entry-level digital oscilloscope designed specifically for courses such as electronics, physics, and automation in middle schools, vocational schools, and universities. Enable students to "see" electrical signals and quickly understand abstract concepts such as waveform, frequency, amplitude, etc. Waveform freezing/playback/comparison function: can save 1000 waveforms and call them up at any time, convenient for classroom evaluation. Typical experimental case: Observing the capacitance charge discharge curve and understanding the time constant; Measure the frequency spectrum of audio signals and conduct "visible sound" experiments; Capture serial UART waveform and analyze digital communication protocol; Compare the ideal square wave with the RC integrated waveform to verify Fourier's idea.