Withings WiFi Body Scale - automatically transmits your weight to your iPhone, iPad, and iPod touch. It also graphs your weight, lean/fat muscle mass and BMI so you can access it from your iOS device at any time.
Wifi Scales with iPhone + Android App - By far the easiest way to keep track of your weight, these scales sync your mass measurements with your phone so you'll know whether your diet is working or not.
The Omron 5 Series blood pressure monitor features a two user mode which allows two users to measure and track their readings separately in memory to better understand their changing blood pressure over time.
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