The "Visual Harmonic Motion" teaching instrument designed specifically for high school and university physics classrooms magnifies the displacement time curve of a spring oscillator or pendulum in real time on the screen through optical projection, helping students intuitively understand concepts such as amplitude, period, and phase. One click switch between "in-phase/in-phase/90 ° phase difference" modes for easy explanation of the superposition principle. Typical experiment: Verify the formula x=A · sin (ω t+φ) and measure the value of g. Demo of damping vibration: Comes with magnetic damping accessories, making the attenuation of curve amplitude clear at a glance. Composite beat frequency: When the frequency difference between the two oscillators is 0.2 Hz, a beat envelope line appears on the screen.