Blood pressure sensor

Hello, I am building a heart rate monitor, which measure the heart rate through the temple vein blood pressure.

Initially I thouth for this item but my delusion is very high when I notice it's very noisy and quite non accurate; so I am asking if you know something else.

It's not important if it will be more expensive, cost is not a problem; which I need is a very accurate and affordable sensor.

Regards

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