I've seen this:
http://fineoffset.com/rain_gauge_new.htmIt seems like that new rain gauge with a few improvements will be more accurate, but I can't find it in any online shop. Every shop seems to be still selling the stations with the old rain gauge.
Also seen this article:
http://www.digitalham.co.uk/weather/equipment/wh1090/Where it's said the 1090 has a newer upgraded screen but, again, it seems like shops selling the 1090 are still using the old console.
Do you know where the new versions can be found? (specially interested in the updated rain gauge).