Digital Anemometer is an instrument to test the speed and direction of wind. Its working principle is: put a thin metal wire in the fluid, heat the metal wire with current, so that its temperature is higher than the temperature of the fluid. When the fluid flows through the metal wire in the vertical direction, it will take away part of the heat of the metal wire, so that the temperature of the metal wire will drop. According to the theory of forced convection heat exchange, the fluid velocity can be calculated.
