Having bought a weather station pluvio anemometer ...

Having bought a weather station pluvio anemometer WS 6868, let's be very clear: no need to be like me! While temperatures and rain gauge show correct readings, it is not the case for the anemometer which a day of strong mistral bursts at 120km / h according to Meteo France, shows a 17km / h!
Who are we laughing at ? Apparently the problem is the same on other models of this brand, so do not be fooled!