High quality device, ideally suited to monitor their own blood pressure over extended periods and represent graphically. Especially if, like me get a blood pressure medication, the doctor is pleased with the excellent data on which he can read the effect of the drug exactly. It lacks only unfortunately the unit receives a guest mode, in which someone else is able to measure his blood pressure (eg partner) without the measurement result will be saved and thus distort the analysis. Although man can disable in the evaluation software single measurement results, but this is relatively cumbersome. (Available in the upper arm instruments of Boso is like him) with a guest mode, which prevents the store, that would be much easier. That's why only 4 instead of 5 stars.