Thoughts?
https://cgi.ebay.com/Wind-speed-Anemometer-Wind-Gauge-NEW_W0QQitemZ200100947261QQcmdZViewItem
I've used a similar guage at meets before to the one below. https://www.everythingtrackandfield.com/detail.aspx_Q_ID_E_3283_A_CategoryID_E_412
The only difference I can see between them is the tube on either side of the fan (cuts down on cross wind influence) and the tripod and, of course, a huge $ savings.