Yep. Spikes are about 1hr 20 minutes apart, and up until yesterday (before build 19) was a constant 3mm (I think).
My site here:
http://turbopascale.sytes.net
I had everything set for 24 hr time, but just noticed the base station was reading american date format for some reason. Just switched that over, and will see if that makes any difference.
As far as I can tell, the main unit has the right rain readings, although everything in there could be rubbish. I haven't attempted to calibrate it to known values at all. Nor have I actually compared base unit readings with what WD is returning to compare.
Thanks for the feedback though - looking forward to it reading vaguely right soon! I want to mount the unit properly, but have avoided putting it up out of the way until I can be sure it's right.
Turbo