The Quantified Self movement, which advocates measuring and tracking physiological data, has a new tool. A Withings scale not only measures your weight when you stand on it, but also your heart rate, and it sends the findings to a personal Web page and your phone.
The scale, the Withings WS-50 Smart Body Analyzer, connects by Bluetooth to Android and Apple phones through an app, as well as connecting to the Web by Wi-Fi to send your results to a Withings Web page called a dashboard. That allows you to track fluctuations over time.
The scale also calculates your body mass index. And it has a CO2 monitor, to give you indoor air quality. Elevated CO2 can raise your heart rate and affect sleep quality.
The data from your scale can be shared with other apps, and other devices can share with the Withings app. If you are using a BodyMedia monitor, your activity and sleep data can be linked to the Withings dashboard.
It connects with other devices as well, like Withings's own blood pressure monitor and some popular apps like the exercise tracker RunKeeper.
If you don't want to get all of those extra tracking devices, some of the data, like blood pressure, can be typed in manually. Withings doesn't track your food intake, but will send its data to sites that do, like Daily Burn.
In a test, using the scale was a little complicated. For instance, when someone else stepped on it, the scale stopped recognizing me. It took quite a few steps to get reconnected. When reconnected, at first it wouldn't record my heart rate (when it finally did, I was so exasperated my ticker rate was abnormally high). When it did read my heart rate again, at first it didn't send it to the phone, and then later it did.
The Smart Body Analyzer is available online for $150.
A version of this article appeared in print on 04/11/2013, on page B12 of the NewYork edition with the headline: A Tool to Measure Your Physiological Well-Being.