Sorry, I can't find any errors with the piezo rain rate, although the piezo rain rate below 1.5 mm/hr is actually useless. I've already written to Ecowitt support about this. For the piezo rain rate (in my case, the hail value), I have to multiply the value by 25.4 in the graph (and only there) to get the display in mm.
[image: Rain_current.png] p q schrieb am Donnerstag, 11. September 2025 um 19:41:09 UTC+2: > I am pretty sure the US uses the international inch for far longer. Since > before I started working with canadian companies in the 1990s. There is > official looking documentation that shows the international yard (and thus > the inch) defined in 1959 > https://usma.org/wp-content/uploads/2015/06/sp447-app5.pdf?x40840 > There are still various survey foot definitions with slightly different > values in the US, and of course the nautical mile and related measures. > https://oceanservice.noaa.gov/geodesy/international-foot.html > > This rabbit hole is deep if you want to dive into it. > > On Thu, Sep 11, 2025 at 10:26 AM John Smith <[email protected]> wrote: > >> On Fri, 12 Sept 2025 at 02:18, Paul R Anderson <[email protected]> wrote: >> >>> Inches and millimeters have a conversion ratio where one value is >>> approximately 1/29 the other. Specifically, 1 inch is equivalent to 25.4 >>> millimeters. The approximation is not exact but is a common comparison for >>> visual estimation. >>> >> >> The inch was standardised to be exactly 25.4mm, except for the US, >> although that changed in 2020 according to Wikipedia. >> >> >> -- >> > You received this message because you are subscribed to the Google Groups >> "weewx-user" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> > To view this discussion visit >> https://groups.google.com/d/msgid/weewx-user/CAGTinV4mAG387-k2eidpaZMDZ7i5OTh2diZHjcpHof0ZzqQsig%40mail.gmail.com >> >> <https://groups.google.com/d/msgid/weewx-user/CAGTinV4mAG387-k2eidpaZMDZ7i5OTh2diZHjcpHof0ZzqQsig%40mail.gmail.com?utm_medium=email&utm_source=footer> >> . >> > > > -- > Peter Quinn > (415)794-2264 <(415)%20794-2264> > -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/d/msgid/weewx-user/9b582e6d-3fe4-484f-ae96-c84991f7d33cn%40googlegroups.com.
