Hi Smedg,
A wind meter is a nice bit of gear for use when you need exact wind speeds for kite reviews and if you are in areas which do not show wind on the water well, like Augusta or any sort of mountainboarding on Terra Firma.
A good quality anemometer like the Windtronics 2 is a precise measuring instrument and not something I'd buy second hand from e-bay. It must be kept clean and in it's case so it doesn't get sand or crap into it to keep it accurate.
We use anemometers in the school for confirmation of upper and lower wind strengths although I can usually tell the wind speed to within a couple of knots by looking at the water.
Beginners who have no experience with wind or water sports need wind meters to judge the wind strengths until they get experience. They get that experience by looking at the read out and then at the water to get a visual indication or reference of what 20 knots looks like. Saying they are for geeks and freaks is a bit harsh don't you think Ben?
When buying wind meters, you get what you pay for and the better quality ones use a paddle wheel type impellor with the little half cups, not the fan impellors types. Such as the windtronics
kiteboardingschool.com.au/index.php?page=shop.product_details&flypage=shop.flypage&product_id=32&category_id=11&manufacturer_id=0&option=com_virtuemart&Itemid=84Most other cheaper ones like the ball in the tube type are within 5 knots wind speed which is not good enough, but if you pay $40, thats about the quality you get.
Good winds,