QL-02 airflow pattern tester is a kind of use of ultrasonic principle to atomize water into a large number of mist with a diameter of 1~10um,sprayed out through thetrachea, forming a high concentration aerosol visibleto the naked eye,under the action of airflow in theclean room or laminar flow equipment, a visible airflowpattern organization state is formed, and people can intuitively find laminar flow, turbulence and other airflow phenomena.