Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Irregular Readings

I have high blood pressure and I need to monitor it daily. With all the mixed reviews it was tough to decide on which one to buy. The LifeSource UB-512 was recommended by a friend who has one. It seemed to be as accurate as my doctor's, but after a few days with it. I noticed the readings were too inconsistent from reading to reading all within a minute of each other. I returned it to my friend and purchased the number one recommended unit out there, The Omron HEM-650, I give it 5 stars for accuracy and the Advanced Positioning System it uses. I get consistent readings each time.