Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Too frustrating

When I bought this product I was relieved that I would finally have a blood pressure cuff to help take assessments on the unit I work on. In a nursing home, having a portable wrist cuff is a must in order to assess patients and give medications safely. I tested the cuff on myself before I ever tested it on anyone else. When I tried using it on patients, I found it more and more difficult to get a reading. This machine was so touchy that it wouldn't even start unless in the EXACT position, which was completely frustrating. after trying it on 3 more patients, and myself again, it still wouldn't register to begin taking a reading. I completely gave up using it and sent it back. Its a great machine when it works, but I wouldnt suggest this particular model to anyone.