I own and use a Kestrel 1000 pocket guage and Springco Wind Guage System (complete with tripod), as well as operate a UCS Wind Guage configured for Lynx. I use the Springco for horizontal jump events at regional championships. The pocket unit is a soft backup or when events are going at different times and opposite directions.
In my experiences, the Kestrel has an accuracy of 0.2% of the Springco unit when setup to the wind and 0.14% when setup with the wind. Though setup on a tripod, the Kestrel was compared using a homemade wind tube.
Alternatively, when I replace the Springco guage with the Kestrel in the Springco configuration (tube and tripod), the difference is less than 1% (=< 4 mps) in both directions to that of a calibrated UCS (sprint events). The Springco guage is less accurate. Perhaps a factor of impeller quality.