Numerous studies have shown wrist blood pressure monitors to be lacking in this regard when compared to arm strap monitors with the majority of results coming off a little higher. Also, their accuracy seems to vary to a greater extent when accounting for quality and price, with the best of these being comparable to upper arm monitors.
However, for everyday needs, their accuracy is considered satisfactory, especially if the doctor analyzing the results is aware of the device’s particularities. Precision can also be increased with user experience since their readings are dependent on the body’s position at the time.