Instruct: Classify a given review into positive or negative sentiment.
Query: Inaccurate BP Monitor!

I purchased this monitor because it is more compact than an arm monitor and was prepared for some loss in accuracy. However this model is so inaccurate that it is utterly useless. I took repeated measurements using this monitor. The measurements were were way off, typically by about 25 points for systolic and by about 15 points for diastolic compared to the BP monitors at the hospital where I work.