Title: Too much variation
Product review: The WS-820 seems to work very well for some people and poorly for others. I am one for whom this item worked poorly. It fluctuated all over the place, and these fluctuations were as large as 30 mmHg. Things improved when I followed the recommendations of one of the reviewers, that is, to hold the monitor directly against my chest so that it was at my heart level. Nevertheless, I still see variations of +/- 20mmHg. That is simply too much variation to use for medical monitoring.Pity because this thing is very easy to use. But I cant recommend something that displays such variation.
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