Question about Omron M3 Comfort

Maybe this will help (via Omron CH).

How can I recalibrate my OMRON blood pressure monitor?
For all Omron blood pressure monitors, the recommended time between
time between calibrations depends on the use of the product.
use. If the monitor is used in a home or private environment
environment, we recommend that it is recalibrated every 2 years.
every 2 years. If the monitor is used in a clinical environment
environment, such as a doctor's office, we recommend that it be
annually to ensure the accuracy of the results.
results.
Omron blood pressure monitors have a warranty of 3 years from the
date of purchase. If you still have a copy of your receipt or invoice, we can
we can service your monitor for 3 years from the date of
free of charge.
If you would like to proceed with this, please follow the
instructions below to ensure a quick turnaround.
...processing.
You will need to include the following:
- A brief note stating that your device needs servicing
and explains the problems you are having in getting readings.
getting readings.
- Your return address - Items will be sent via our
designated courier, so the return address must be where someone is
must be where someone is available to do so.
- Daily contact number
- A copy of your sales receipt or invoice (with purchase
within the last 3 years) so that we can carry out the training free of charge.
free of charge. Alternatively, you can contact us using the
serial number on the back of the monitor so we can check when it was
we can check when the monitor was manufactured, as we will
we can start the 3-year warranty from the date of manufacture
if you no longer have a receipt. If you have had your
monitor for more than 3 years, we can of course service it outside of the
we can of course service it outside the warranty period.
There is a standard charge of £30 for this, which should be paid by cheque to.
"Omron Healthcare UK Ltd".
Postal address:
Technical Support
Omron Healthcare UK Ltd
Opal Drive
Fox Milne
Milton Keynes
Bucks
MK15 0DG