At this point, Withings has to be the most complete biometric suite in existence outside of a hospital or Langley. The outfit began with a scale (which also measures body-fat percentage), added a separate blood pressure cuff and then snuck an air-quality sensor and a pulse meter into their scale.
The latest addition is the a wearable activity tracker that adds a feature unique, at this point, to activity trackers: a pulse meter (which explains why they’ve named it the Pulse).