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So far the Rainwise 8" rain bucket has been operating fine. But with no calibrated reference I had no idea of accuracy.

I recently picked up a manual rain gauge from CoCoRaHS. Since midnight the 8" Rainwise has measured 0.81" of rain and I just checked the manual rain gauge and it also has exactly 0.81" or rain. So it looks like the rain bucket is pretty level and the calibration is spot on. For comparison my commercial weather station from Ambient Weather reported 0.80" of rain. Looks good all the way around.

Should be interesting to see if there's a difference in heavy rain.