Test method
How we test BP monitors
How we test home blood pressure monitors: reading spread, paired readings against a reference monitor, cuff fit, reading time and battery life.
Every BP monitor we review is used daily for three to four weeks by several adults of different ages and arm sizes, at home, on the unit we bought or borrowed. Each session follows the same routine: sit with the back supported and feet flat, rest for five minutes, cuff on the bare arm at heart level, no talking, then three readings a minute apart.
We compare each monitor with a validated reference upper-arm monitor, but a home comparison is not a clinical validation study. Before relying on any monitor, look the exact model up on a validation list such as validatebp.org and compare it once with your doctor’s device. Home readings help your doctor see a pattern; they do not replace a diagnosis. Each result in a review links back to the matching test on this page.
What we score
- Elders measuring alone
- How easily an older parent can wrap the cuff, start a reading and read the result without help.
- Sharing within a family
- Whether two or more people can keep separate readings, through user memories or an app.
- Larger arms
- Whether the supplied cuff closes properly on bigger upper arms, since a cuff that is too small gives wrong numbers.
- Tracking for a doctor or family
- How easily readings can be logged, charted and shared with a doctor or with family in another city.
- Travel and backup
- How compact and easy to power the monitor is when it is carried away from home or kept as a second device.
The tests
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Spread across three readings (systolic)
In each morning and evening session the tester sits and rests, then takes three readings a minute apart. We note the gap between the highest and lowest systolic number and report the typical spread over the test period. A smaller spread means steadier readings.
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Average systolic difference from reference
Several adults take readings over three to four weeks while a validated reference upper-arm monitor is used for paired readings, on the other arm for upper-arm models. We report the average systolic difference as a plain number and say in the note whether the monitor read above or below the reference. This is a home comparison, not a clinical validation study.
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Average diastolic difference from reference
From the same paired readings as the systolic comparison, we report the average diastolic difference from the reference monitor as a plain number, with the direction in the note.
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Time for one reading
We time a reading from pressing start to the result appearing on the display, over several readings, and report the typical time.
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Readings per set of batteries
Starting with a fresh set of alkaline cells of the type the monitor takes, we count readings until the low-battery symbol appears or the cells run out. The cell type is noted with each result.
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Cuff fit on our testers
We try the cuff on testers' upper arms from 24 cm up to the largest arm in that test group, between 34 cm and 40 cm, or on testers' wrists for wrist models. We note where it closed properly and where it sat loose or barely closed.
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Effect of a low wrist (wrist models)
For wrist monitors, we repeat sessions with the wrist deliberately held too low and compare the readings with those taken at heart level, and note whether the monitor warns about the position.
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Pairing with a phone app
For Bluetooth monitors, we pair the monitor with several phones using the brand's app and note how many paired on the first attempt and how long the others took.
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Runs on USB power
For monitors with a USB port, we run them from a power bank or phone charger and compare readings with battery power. Pass means readings showed no change on USB power.
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Voice volume at one metre
For talking monitors, we measure the sound level of the spoken result one metre from the monitor at its top volume setting.