I chose this sphygmomanometer, which it did very well in the comparison test of Swiss Television SRF, ie the best price / performance ratio. The tube to the cuff could be a little longer, but otherwise the device is very convenient to use and requires only a short measurement time to determine blood pressure. Positive also that in the instructions for all the service centers are set leads to the unit checked by two to three years (although this probably will cost more than a new device ....) The instructions stated that when pressing the start button, a test tone is done, but I've never heard my set.
