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.
An anemometer measures wind speed. It also can be attached by electric wires that transmit the varying speeds, wind speed changeds during the day with wind gusts, and recorded on a cylinder with graph paper showing the numbers or values of that wind speed. a windometer, a large tubular device 20 ft long and one foot high.