So I ordered the BOSO BS90, which was delivered by the company 'My Health Home' two days later very carefully and shockproof packaging. The device actually made a very good impression. The only drawback: The spring that compresses the bow of the stethoscope was so tight that you had to worry about, to shrink the brain, at least you could throw away after measuring the innards of his ears. By carefully bending the spring, however, managed to make the pain bearable. Actually, I was hoping that would display some mean between the values of my 3 other devices the device. But far from it: it was by far the highest value of all to, and in comparison to gauge my doctor (which is also a BOSO). Now I wanted to know: I brought the new BOSO and my old electronic upper arm device, whom I trusted most likely, but that up to 40 mm Hg by BOSO brought different results to a test center for medical devices to ensure the accuracy to have it checked both devices professional. Big surprise (and not for the test engineer): Both devices showed over the entire measurement range at very closely! Conclusion: Not the static accuracy of the gauge is decisive, but the way how the inputs and exposing the Korottkov-noise is detected during deflation, ie human ear to the algorithm of the machine. In particular, when an irregular pulse of the machine has zero chance. Added to the usual circumstances that should be considered: a plurality of measurements with subsequent averaging several minutes rest before and between measurements, relax the arm muscles, measurement while sitting, etc. I will therefore continue in the BOSO leave in view of the realization me have for years enjoyed a supposedly normal blood pressure. For the BS90 and the supplier really 5 star, because of the murderous stethoscope a point deduction.
