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... Can any rain gauge actually measure 0.1mm of rain? I would think the bucket tip would require a lot more rain than 0.1mm.

I have referred 0.1mm just as a reference value, however there are some rain gauges that can measure 0.1mm of rain, and 0.2mm are common. The metric versions of the Davis rain gauges, all use a 0.2mm tip bucket.

...2 decimal places is what we normally use. 0.2mm could be rounded up to 0.01

Thanks for that info. If using just 2 decimal places is acceptable to display rainfall in inches, so that option it will be implemented on next software release.

Relatively speaking 0.2mm is twice as much as 0.1mm.   I've been using cheap chinese weather stations since about 2005, Davis was out of my price range, but nice to know their rain gauges are very good.

Thank you for adding imperial units for rain on the display. I would have to pull out my calculator to convert from those funny numbers to other funny numbers.