Bernard, Thanks so much for your help and advice. That's exactly what
this group does best, helping an amateur.

Hugh
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Well said Hugh, I agree. Despite some leaving and a few trying to spoil
it I am so glad there are still several contributors who are there to
observe, help and inform and enjoy weather comments. Makes sticking it
out worth it.
I seem to remember from a couple of years back you had a Watson type
station similar to mine? If so, whilst they are capable of some
excellent and accurate measurements, they do occasionally have their
"funny half hours" ! I tend to find one of the following fixes most things.
1. Reboot of PC
2. Shutdown software (Cumulus?) and restart
3. Disconnect and reconnect USB lead
4. Check batteries in sender unit (and console although they seem to
last forever)
5. Check connections of leads although not really applicable to humidity
as this is sent directly wirelessly from the sensor.

Good luck,
Dave