US Patent 7568392 Measuring apparatus for a mower

A measuring apparatus for a mower includes a floor defining a downward recess with respect to a floor surface, and an air speed measuring device or air pressure measuring device disposed in the recess for measuring a speed or pressure of air blown by the mower. The measuring device has air speed detecting elements or air pressure detecting elements. The air speed detecting elements or air pressure detecting elements have detecting heights including a height level with the floor surface.