Morning Mark,
This supplier offers good info on this product -
http://www.proactmedical.co.uk/cat/01/03onyx9550.htm.As you can see, a 3 year warranty which covers breakdown and calibration issues. So, 3 years peace of mind. If it breaks after that, replace it.
Proact have told me that the majority of the problems related to this item are due to cheap batteries being used.
Cheers
Mark
