Accuracy of readings?

I have been using the index bpm for about a week now.  How are others finding accuracy compared to other units?. 

I am questioning the accuracy of mine.  Readings have been significantly higher than my older unit.  Today I visited physician and we compared results.  The Garmin was showing 158/106, the nurse was getting 132/84.

  • Taking a reading while lying down will always give lower readings.

    the correct method is to sit in a chair.

    in any case I’ve found the Garmin to be wildly inaccurate and support is terrible: they refuse to acknowledge a problem.  Also they told me that unless  the readings were out by at least 20 points on both systolic AND diastolic they thought the unit was fine!