How accurate are they ? I read over the spec's and manual for it and it claims to be within a +/- 3 range of true accuracy. I still find this hard to believe. Today and lately my pressure has been 118 / 81. I'm just unsure if this thing is telling me the right numbers. I could take it in to my doctor I guess, and get her to check my pressure with my moniter and see if it goes up as it normally would in the office.

If you add 3 points on to that reading it is still only 123/84 which isn't too bad right? But i'm at home in a relaxed setting and I'm sure that number will change when at work.

Life Source is a very good brand. My doctor tells me to take my BP this way: take it 3 times. Toss out the first reading, and take the average of the next two. He has a monitor in his office that takes my BP 6 times in a 6 minute time period, and then calculates the average.

I have a Life Source and an old Micronta, both are no more than about 2-3 mmHgs different than the other at any given time. Like people before me said to take it three times in a row and average the readings. Also, taking it to your doctors would help so you can compare the "at home" monitors to the "manual" way of taking BP.