I tried off-and-on for the first 2 days owning this to get a good and consistant reading. The readings were almost always high, or occasionally ridiculously low. I was about to send it back when I decided to try something. In the quick reference instructions, they show a picture of something supporting the forearm to keep it at heart level, but don't say what this item is in the text. If you read the full instruction manual (RTFM, STUPID!!!!) they call it an armrest. Later in the manual they suggest using an object such as the carry case to support your arm.
Turns out, the top of the small carrying case the monitor comes in is nicely curved and angled to fit your forearm, and when I set it up like in the picture, the readings became consistant, and the readings came quite close to my other, larger electronic monitor with arm-cuff and bulb (which I have had checked out at my doctor's office, and is very accurate).
So it seems that this unit likes to be used only one way, and if you do that, it appears to work quite well. Now I like it, and am going to keep it. It is interesting how sensitive it is to position compared to my other monitor, however.Get more detail about Wristech Blood Pressure Monitor.
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