An actual validation scatter plot from a Beurer BM85 machine. If the machine was 100% accurate all of the dots would form a single line at zero. This plot reveals that on average this machine reports results that are 10 mm higher than the reference device. In addition, there are a number of times that it was more than 10 mm off. This machine was validated. From: Wetterholm M, Bonn SE, Alexandrou C, Löf M, Trolle Lagerros Y
Validation of Two Automatic Blood Pressure Monitors With the Ability to Transfer Data via Bluetooth
J Med Internet Res 2019;21(4):e12772