This will ensure that the wind direction is accurate. You need to supply your own vertical mounting pole. The anemometers mounting bracket has two U-bolts that are approximately 1.25 inches on the inside diameter. If the mounting is above a roof, make sure that the anemometer is at least four feet above the highest point of the roof. This will ensure that the anemometer does not get any reflected wind from the roof.
Wind speed is determined by counting pulses over a sample period.
The sample period is 2.25 seconds.