Fit Cuffs – Bluetooth Device (LOP). Research has shown that this method (oscillatory blood pressure measurement), is valid method to assess Limb Occlusion Pressure (LOP) compared to a hand-held Doppler ultrasound, relative to the golden standard i.e. invasive methods. Our preliminary testing is showing a very good inter-rater reliability, by comparing this Bluetooth Device vs. LOP assessment by hand held Doppler, as a variance of only 3-6%. This is a convenient and validated alternative to Handheld Dopplers.