I use them and the noise they make is why some still refer to bite alarms as buzzers. There are no single bleeps, peeps, pips or any of that warbling that goes on with the Delkims. I'm sure the buzzer from the Heron's sounder box would be well at home in the servant quarters of a mansion house.
A vane anemometer thus combines a propeller and a tail on the same axis to obtain accurate and precise wind speed and direction measurements from the same instrument. The speed of the fan is measured by a rev counter and converted to a windspeed by an electronic chip.
Help your wind expert complete the compass rose worksheet to show the direction of the wind for the season that you will be broadcasting! Do you know what a weather vane is? A weather vane is a weather instrument that measures wind direction. Wind is moving air, it can be moving different directions at different times. A wind vane looks like this: