The NRG #40C anemometer is the industry standard anemometer used worldwide. A calibration certificate verifying that the sensor is traceable to the National Institute of Standards and Technology (USA) is available through electronic download. NRG #40 anemometers have recorded wind speeds of 96 m/s (214 mph). Their low moment of inertia and unique bearings permit very rapid response to gusts and lulls. Because of their output linearity, these sensors are ideal for use with various data retrieval systems. A four-pole magnet induces a sine wave voltage into a coil producing an output signal with frequency proportional to wind speed. The #40C is constructed of rugged Lexan cups molded in one piece for repeatable performance. A rubber terminal boot is included. NRG #40C Calibration Reports Available Online! Try our new Calibration Report Retriever.