Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Consistently inaccurate = fail

The systolic reading was consistently at least 20 marks too low than what I know it really is. This is true even though I am certain of operating it correctly and taking over 100 readings with it in a 2 week period. Yes, the cuff was correct size. The diastolic reading was correct, though. The reason I bought a monitor is because I know from professional readings that my systolic is too high. But this thing says my BP is very normal. Trusting this thing could kill you. The primary function of a BP monitor is to accurately monitor both systolic and diastolic. So this is fails at functioning and is therefore worthless. All the extra stuff that comes with it is just a gimmick and is not necessary for your health. I doubt I can let myself buy another Omron product. Product returned for full refund. Thanks to Amazon for making it easy to return at no cost to me.