[JT118]

My single click modification is just a reed switch with the tail bent down to interfere with the magnet only once. Not sure how a Hall sensor would work with an old Weather Wizard; it would probably be OK.

Here's a list of anemometers on UK ebay which may be of interest; not all suitable for weatherduino as currently configured but probably can be made to work.

Walker wind speed direction sensor P296 and Indicators
http://www.ebay.co.uk/itm/301643285485?_...EBIDX%3AIT
Anemometer: Model：JL-FS2
http://www.ebay.co.uk/itm/321721534658?_...EBIDX%3AIT
Anemometer 24v Three Cup Aircraft 4 Way Plug
http://www.ebay.co.uk/itm/261886288376?_...EBIDX%3AIT
Somfy WIND SPEED SENSOR FOR SENSOR STATION
http://www.ebay.co.uk/itm/301136922764?_...EBIDX%3AIT
Davis Instruments Anemometer 7911 for Wizard, Monitor
http://www.ebay.co.uk/itm/291250989221?_...EBIDX%3AIT
Rainbird Anemometer for the Maxicom2 wind speed meter
http://www.ebay.co.uk/itm/231490378630?_...EBIDX%3AIT
Inspeed Vortex Wind Speed Meter Digital Anemometer
http://www.ebay.co.uk/itm/Inspeed-Vortex...1662009111?
Raymarine Autohelm ST50 Wind Speed PCB Windvane Vane Circuit Board
http://www.ebay.co.uk/itm/370834161057?_...EBIDX%3AIT
A.P.C.S RC7852M TIPPING RAIN BUCKET
http://www.ebay.co.uk/itm/111668745494?_...EBIDX%3AIT

and bargain!:

Pack of 5 Maplin / FO Replacement Wind Speed Sensors for N96FY:

http://www.ebay.co.uk/itm/Pack-of-5-Mapl...1e9f0eb7d6