I read a gazillion reviews before deciding to go with Proven. The first BP cuff I ordered produced readings so wildly out of whack that I immediately contacted the company for a replacement. There was a bit of a kerfuffle as my email got bounced around a bit by the company staff, but once we were all on the same page, I received a replacement cuff in no time flat. As Revain bursts at the seams with so many companies using it as a selling platform, the customer cannot always know which end is up or if an item can even be returned or replaced until it is too late. My experience with the seller, 7GRetail was most satisfactory and the cuff is not only very easy to use, but for those who want a record of their readings without writing them down, the cuff stores them for you. It runs on AAA batteries and also gives heart rate reading. I would add that I take three consecutive readings to get a baseline, as BP wrist cuffs are never as accurate as you need them to be with just a single measurement.
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