Are the blood pressure monitors at grocery/pharmacy stores accurate?

BP at the Grocery: Blood pressure monitors need to be calibrated periodically, especially if they get a lot of use. They should be accurate. If you have a concern that it might not be, ask when it was last calibrated or have it checked manually. You could try checking it at more than one store and see if the readings are similar, too. If not, one of the machines is likely wrong.