The $40 device that changes conversations with your doctor.
Home readings beat clinic-day nerves. Here is how to pick a monitor that tells the truth.
Upper arm, always
Wrist and finger monitors are convenient and consistently less accurate, because the reading changes with the position of your hand. Every guideline that mentions home monitoring says the same thing: an upper-arm cuff. That single choice matters more than any feature on the box.
Validated beats fancy
What you are paying for is a machine that has been tested against a proper clinical measurement, called validation. Established brands like Omron publish this. Bluetooth, apps and multi-user memory are nice; validation is the part that makes the number worth writing down.
Cuff size is the silent error
A cuff too small for your arm reads high, sometimes 10 points high, and sends people to the doctor worried about a problem the cuff invented. Measure around your upper arm and check the size range on the package. Large arms need large cuffs.
Then use it properly
Five quiet minutes first, feet flat, arm supported at heart height, two readings a minute apart. Our free checker reads your numbers against both US and European systems and prints a 7-day log sheet your doctor will actually want.
If you are buying a monitor
Get an upper-arm cuff, not a wrist one, from a validated brand like Omron. Expect $30 to $60. Check the cuff size fits your arm; a too-small cuff reads high.
See validated upper-arm monitorsCommon questions
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Written by the AskDoc Medical Team. We take no money from any brand; picks are what doctors tell patients to look for.