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*if your model uses a touch sensitive screen then it is probably tap the reading three times, then touch '+' or '-' to adjust value.
The support forum includes discussion on where to find isobar charts or other sources to determine what the pressure should be - make sure you use a reliable source of data, e.g. a Met Office station if in the UK. Obviously after any adjustment you need to stop Cumulus, because it is when you restart it that Cumulus reads the new pressure offset.
Sometimes the offset that cumulus reads from the fixed block is clearly garbage, so
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