Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Blood Pressure Monitor

Omron HEM-780 Automatic Blood Pressure Monitor with ComFit CuffI was very disappointed with thia item, which did not perform as expected.The cuff was difficult to apply by one person, without assistance.When it was correctly applied, following instructions, it either failed to inflate properly and gave an error reading or it over-inflated (very painfully) and gave very high incorrect readings. I had these readings checke for comparison by a professional.Professionals must have their monitors checked and corrected frequently foraccuracy. As a casual user, I had no facilites to perform this function.I have returned the monitor for refund.Margaret Corder3271 Samuel RoadAkron, Ohio, 44312