If you’re keeping a close eye on your blood pressure, and want to track trends over time, this Bluetooth Withings monitor makes it as easy as opening an app on your smartphone.
Each time the monitor gets a reading from your upper arm, it’ll automatically transmit the data to your iPhone or Android device, and put it on a chart so you can track your trends. For a limited time, Prime members can grab it for $74, an all-time low.
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