Blood pressure readings - First 136/88 then 128/84 upon second reading. Why?

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I checked my Blood pressure with the same machine twice on the same arm. First the reading was 136/88 and then when checked a 2nd time the reading was 128/84. I checked my blood pressure with a 2nd device and it was Why?

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it was.......?More numbers would be better.I would check it each day with both devices. alternate which one you use first.Sit 5 min. Take 3 readings with each (30-60 seconds apart) and send numbers in an email and I can help test them.CE Grim MDOn Apr 4, 2012, at 5:32 AM, airlinerg wrote: I checked my Blood pressure with the same machine twice on the same arm. First the reading was 136/88 and then when checked a 2nd time the reading was 128/84. I checked my blood pressure with a 2nd device and it was Why?