We have an automatic cuff for taking blood pressure. Have never had any trouble with blood pressure either using it or at the doctor's office with the manual one they use. I do know that you have to do exactly what the automatic one tells you to do - sitting a bit, correct position on your arm, etc.

Again no problem ever with blood pressure. Just take it now and again. The ones at a store such as WalMart, Target, etc. are not that accurate and a person always seems to be in the midst of someone going by, talking, noise and some kids screaming and asking if you are done while running around. No good. That did happen and then I bought my own. One recommended by the pharmacist. Works great.