A correctly fitted cuff matters as much as the monitor itself. The SonoHealth BPpro is an upper-arm monitor — measure your arm to confirm the cuff range fits before relying on readings.
Why does cuff size affect accuracy?
A cuff that’s too small squeezes harder and can read falsely high, while a cuff that’s too large can read falsely low. Because the cuff is what actually senses your pressure, an ill-fitting one undermines an otherwise accurate monitor.How do I measure my arm for a cuff?
Wrap a flexible tape measure around the midpoint of your bare upper arm, halfway between the shoulder and elbow. Compare that circumference to the cuff’s labeled range. If you’re between sizes or near the edge of the range, check the manufacturer’s guidance.How should a cuff fit?
Position the cuff on a bare upper arm, snug but not tight — you should be able to slip one or two fingers underneath. Rest your arm so the cuff sits at heart level, and keep still and quiet during the reading. See the full measurement technique guide.Upper-arm vs wrist cuffs
Upper-arm monitors are generally preferred for accuracy, while wrist monitors are more position-sensitive. If you use a wrist device, follow its positioning instructions carefully — read our upper-arm vs wrist comparison for the tradeoffs.Sharing a monitor across different arm sizes
If several people in a household share one monitor, make sure the cuff range covers everyone’s arm. Where arm sizes differ a lot, a different cuff size may be needed for accurate readings for each person.Related: How to Measure at Home · Upper-Arm vs Wrist Monitors · Why Readings Vary · Blood Pressure Overview