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Fitbit One compared to wrist model not even close

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I got a One and wear it on my torso. My friend has the wrist model. Today, we spent the entire day together from 7am to 7pm. We compared our steps, and mine said about 3500, while hers said about 7000. This couldn't be due to a difference in stride length. I don't know what to make of this. Can I trust my One? Can anybody help me understand and adapt?

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@kaysd wrote:

I got a One and wear it on my torso. My friend has the wrist model. Today, we spent the entire day together from 7am to 7pm. We compared our steps, and mine said about 3500, while hers said about 7000. This couldn't be due to a difference in stride length. I don't know what to make of this. Can I trust my One? Can anybody help me understand and adapt?


@kaysd Welcome, I use my One as my gold standard because if I do gardening or use a shopping trolley and push my daughters wheelchair I get massive differences. I have tested the Blaze and tried different arm movements while walking and lose 10%-15% but if I'm in a domestic mood, cleaning etc the Blaze outstrips the One by a similar amount. If I put the blaze in my jeans pocket it gets with 1% of the One.

 

The best test is for you both to do a walk on flat pavement in multiples of "manually counted" steps and compare the diiffenence. Fitbit's designs are +/- 5%.

Colin:Victoria, Australia
Ionic (OS 4.2.1, 27.72.1.15), Android App 3.45.1, Premium, Phone Sony Xperia XA2, Android 9.0
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Good information, thanks very much. So, without doing a counted test, I don't really know whether we walked 3500 or 7000! That's a bit disturbing. My guess is her wrist model is counting a lot of arm movements, and that it's more like 3500. (I don't think I want to be the means for her to discover that!)

Sent from my iPad
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