Hello There, We bought this unit a few weeks ago. This is carried out several times a day measurement. We have analyzed the measurements after purchase with different devices and have found that they are very accurate. The price-performance ratio is very good. A small point of criticism is the holder for the arm cuff. If the unit is moved, the holder holds the cuff not good. This small deficiency is however to get over. The device is a strong buy recommendation for us.