@Michael,
I assume you're using
target_unit = METRIC # Options are 'US', 'METRICWX', or 'METRIC'
or
target_unit = METRICWX

I use target_unit = US
I don't know why p_rain is being then written to the database in inches for 
you; I don't have enough experience with WeeWx for that.

But if you use
payload_key = p_rain_in
the display should be correct

[email protected] schrieb am Freitag, 12. September 2025 um 05:25:57 
UTC+2:

> May it's that I use p_rain and not hail:
>
>           [[[[rain]]]]
>                 [[[[[rain]]]]]
>                     payload_key = rain_mm
>                 [[[[[p_rain]]]]]
>                     plotType = bar
>                     aggregateType = sum
>                     aggregateInterval = 1800
>                     payload_key = p_rain_mm
>                     showMaxMarkPoint = false
>                     showMinMarkPoint = false
>                     showAvgMarkLine = false
>                     lineColor = "#428bca77"
>                     decimals = 1
>
> The interesting thing is, when receiving data from LOOP using MQTT, the 
> value is correct, it's only the databa value that isn't.
> John Smith schrieb am Freitag, 12. September 2025 um 03:57:19 UTC+2:
>
>> On Fri, 12 Sept 2025 at 03:41, p q <[email protected]> wrote:
>>
>>> 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
>>>
>>
>> If you disagree update the Wikipedia page with references... *grin* 
>>
>

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