The pressure on the finger is initially increased beyond cutoff and then slowly decreased until arterial vessel pulsation is detected. CalHealth says that "the corresponding cuff pressure at this point will be substantially equal to systolic blood pressure which is the pressure when the heart is pumping."
The decrease of pressure continues until the device no longer registers arterial pulsation where, according to the company, "the pressure of the cuff at this point will be substantially equal to diastolic blood pressure."
The readings are then interpreted by the software and displayed for the user. The software can also store data from previous tests and present the user with graphs for onward email transmission to medical personnel.
There's a release valve to let the air out after each test, so there's no fear of the experience turning into some Jigsaw nightmare where the device starts to menacingly crush the trapped finger.
However, there has been some doubt cast on the accuracy of finger-based monitors. The American Heart Association recommends an automatic, cuff-style, upper-arm monitor: "Wrist and finger monitors are not recommended because they yield less reliable readings."
Source: Gizmag
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