This clinically validated M2 Basic also features a hypertension indicator that displays a symbol on screen if a reading is higher than the recommended blood pressure level of 135/85 mmHg. With a clinically validated monitor, you can be assured that it has undergone tests conducted by independent doctors according to a predetermined protocol, which includes ensuring the accuracy of the measurements (algorithm) of the blood pressure monitor. When using an Omron blood pressure monitor, please ensure that the cuff size is correct. The Omron M2 Basic comes with a standard size cuff for arm circumference 22 cm to 32 cm.