A desktop level, visual teaching/demonstration device that allows any audience to "see" the core conclusion of Bernoulli's equation within 30 seconds: the higher the flow rate, the lower the static pressure; The lower the flow rate, the higher the static pressure. No need for an external computer, plug in and run immediately. Rotate the speed control knob of the fan, and 8 liquid columns rise and fall synchronously, visible to the naked eye. The pressure gauge uses sealed dye water, which does not leak when poured. Applicable scenarios: high school/university physics and fluid mechanics classrooms; New employee safety training for enterprises (air pressure, hydraulic, ventilation systems); Interactive exhibition area of science and technology museum.