It is almost no effect. Freescan® senses the pressure waveform from radial artery wall by an adequate force applied. It does not occlude artery as much as a cuff-based BPM, and not measure the absolute pressure either. All the parameters are relative to time interval and the sensor is in good linear response, so as long as the signal is qualified, the reading will be consistent no matter if it is pressed harder or softer. In fact, Freescan® is more reliable, repeatable, and immunes to human operation in the same physical condition.