As in the embodiment of the "Wrist Blood Pressure Monitor" usual, there is unfortunately system-related deviations when the hand when not measure always 100% the same height.
But as a trick you can even put the hand back on the plastic box (Aufbewarungsbox) and hang with his elbow on the table in order to always have the same angle and height.
Then the measured value is meaningful at least of the trend ago.
Unfortunately I did not get out as you manage the measurement is not automatically saved. Thus, the measurement of a person outside the family is unfortunately attributed to the average of all readings.
I would recommend the sphygmomanometer hesitation also elderly, because the handling is really easy.