Thanks, that helps explain it. I'm also not overly interested in past data history, just the "year to date" rain readings now that the new rain season has started here in the Bay Area. I assume this "year to date" resets on Jan. 1st so I guess I can always wait to unplug this thing until then. We typically never loose power here but I know in the near future our power company has a planned power outage due to repair work. Just wanted to "save" everything before that happens.
I guess I can always reset the rain reading by pouring water into the unit until it reaches the old reading. No reason that shouldn't work I assume, at least I'd still have my true year to date rain readings still.