WS90, or Wittboy, will have a very powerful offset calibration section, completely at user's control, at different rain rate levels to assure the better accuracy performances
the data posted are not useful, I don't know what reference system was used, and, on a metrological view, are absolutely not useful
In the next few days, the beta testers start to receive their ws90, this will be the perfect step to understand if we are on the right way or not, what we need to improve, to change, etc
Until this moment, every supposition has a very low reliability
M.