Why the store blood pressure monitor gives different readings than mine at home?

Today before leaving for work my BP monitor Omrom HEM 780 gave me 145/97 , I went to the store and it gave me 148/105 which is very high , which one I should trust? The Omron has 498 readings , 4 stars at 5 on Amazon.

There really isn't much of a difference between the 2 readings while one can expect a store reading or doctors office reading to be slightly higher because they're not ideal settings both measurements are considered hypertension as they're both over 140/90. Now if there was a significant difference between the 2 measurements then you have the potential for misdiagnosis. Wiki has a good section about the diagnosis of hypertension and measurement of blood pressure and on what perceived ideal settings are feel free to give it a read. http://en.wikipedia.org/wiki/Hypertension

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How to use Omron Blood pressure monitor at www.pharmacyonweb.co.nz