1. The Davis Turbo meter. A hand held unit, battery powered with a red LED
display. Quite a useful accurate unit. Will read wind speed in metres per
sec, mph or kph. at the flick of a switch. i found it quite useful for
stunt kite events where people wanted to know "Whats the wind speed now?"
Out would come the meter and the wind would be checked. Thats the problem
I found. The battery consumption (probably because of the LED display) is
high so you can't leave the thing on all the time, so you only "spot
check" the wind every now and then. 
Most places I've flown the wind is not constant and quite often the
question you get is "how strong was that gust?" - After the gust
naturally.

A second problem I experienced with this was that after about two years of
use the bearings became sloppy and in gusts over about 10 mph the thing
would make a terrible noise and not keep up with the wind speed. I managed
to solve this problem in the end by dissassembling the unit - carefully -
and putting a very small amount of powdered graphite in the bearings. This
is probably not correct for these type of bearings but it certainly shuts
the thing up and its now back on speed in those gusts. The powdered
graphite I used is a very fine type I originally bought for model trains
from a hobby shop.

2. I have also now since purchased a Davis Weather Wizard II. This
required a bit of fiddling to make a removeable mount, a battery supply (
a 12 volt gell cell) and a pole or desk mount for the display. This all
fits into a plastic toolbox with padding and is easy to carry to the
field. I also carry an aluminium extendable pole - ex swimming pool sive
handle - which is light and can be extended up to about 25 feet.
The wind vane goes on the top of the pole and the display can go on the
picnic table or cip on the pole. The battery and all the connectors etc
stay in the toolbox at the bottom of the pole.

This works very well, gives continuous readings of the wind speed and also
logs the max speed gusts against the time. So you can recall what that
gust was we just had! And when its cold and windy you can add to peoples
discomfort by swithching to "wind chill factor" and telling them why they
feel so cold :-)

This in the long term has proved to be a good solution at club fly days
and festivals and beats trying to find some smoke rising to check the
beaufort number!

Good Winds
Godfrey