[werk_ag]

Do you think your see a difference? Have a look at the report I linked to in;

Davis VP2 Station - An Independent Review Against Standard Instruments

http://www.weatherstations.co.uk/special_reports.htm

It would be good to compare your Inspeed to the FO sensors.

I had the two systems working simultaneously, installed in the same pole, for the last three weeks.

I did not do an accurate study of collected data in these three weeks (I'm not very good at doing that), but visually comparing the graphs obtained from both, they are very similar, however the wind speed values (mean and gust) obtained with the Inspeed Instruments are always lower than those obtained with the FO anemometer, but the time (hour and minute) at which Cumulus records peak values (gust) from each one, are equal in both.
The difference on the average speed reads, is not very large, always around 3-4 km/h less for the Inspeed anemometer.

Regarding the Inspeed vane, it's much more stable than the FO, producing graphs with less erratic points. It easily grabs data from any wind direction.
When I tested it at my workbench, I easily managed to read values from 0º to 360º almost in 1 degree steps (the Inspeed vane don't have any dead band).

Here is a pic of my Inspeed wind instruments installation. All the cables run inside the pipes.