I have received the meter on 06.05.2010 and immediately with the use begonnen.Dank excellent instructions I can achieve results that turn out in the spirit of my acupuncture doctor. Measurements, as envisaged in derGebrauchsanweisung (twice daily undzwar in the morning and at night and at rest prior) I will not front on medical advice. My Dotoressa wants namely evaluate all reactions of the heart at different loads and / or sleep modes and succeeds for this reason very well, because I in the three-minute intervals by lead usually three tests depending of previous activity. The long and short of it: I can only recommend the device very much and if a prospective customer makes a such intensive use, how I do it, advise the additional purchase of the power supply.