My Netatmo outdoor module is on the fritz. Because I’m in New Zealand I can’t buy a replacement module but have to buy a new station. Tonight, in the pouring rain, the rain gauge shows zero rainfall! What next?

Well, I finally got around to tipping water into the rain gauge. It made the usual clicking noises and then I got an alert about unusual rainfall. So why didn't it register anything for the approx 30mm rain we had overnight? (Hooray for the neighbour 1Km away who also has a weather station!)