Body Fat% is way off

I consent to Garmin adding me to its internal case. I consent to garmn accessing my account. I am comparing to a Tanita ironman scale  and the previous model Garmin scale. My Garmin S2 registers 27.4% Vs Tanita 21 %.  The older Garmin scale registered 18%.  My activity level is set at 6, this is matched to my current training.

Thank you, looking forward to a solution. 

• Consent to be added to an internal case
• Consent to access your Garmin Connect account (if needed)
• What device/test are you comparing your Index readings to:  Previous Garmin scale;  Tanitha Ironman
• What does your Index S2 display vs what does your reference device display: 28.6%; Previous Garmin scale - 14%; Tanitha Ironman - 14% on athlete setting, 24% when not.
• What is your activity class set to, and is this appropriate for your activity level:  8, Train at least 7 hrs a week, so yes.

Hi Garmin Blake, why the Gamin Index (also the old one) ask the user to choose the activity level if in Garmin Connect there are all datas to choose it in a more correct way? 

Also 24/7 HR datas impact on fat consumption, for example, and not only sports. Garmin could calculate it better than an normal user and ask users to do it is not the best way to have accurate datas, I think. 

• Consent to be added to an internal case
• Consent to access your Garmin Connect account (if needed)
• Withing Body+
• Around 15-16% for Index S2 and around 6-7% for Withing
• Activity set to 10 which is appropriate

• I Consent to be added to an internal case
• I Consent Garmin to access my Garmin Connect account
• Tanita BC-1500 Ironman, InBody
• Index S2 display 24% fat while Tanita displays 14% fat 
• Activity class is set to 10, tried 6, 8 and 10, did not make any difference. Activity class of 8  is appropriate.

Hello! Thank you to all who have replied thus far. We are adding you to our case that has been created. In the meantime please also take alook at this article. Why Is My Body Composition Data Different on Index S2 Compared to Index Smart Scale?

None of these factors mentioned in the article made any difference to Index 1 and I suspect that it remains the same with Index S2. There are issues with your algo.

Thank you for making a case, however, we would still like consistent updates on the progress of the case so that we know whether there will be a solution soon. I agree with RickM, none of the factors in the article apply, both scales were used as instructed by Garmin. 

Please keep us informed 

Amber, I sent my serial number to you. Thank you.

Agree with the others.  Article not helpful.  My scale serial number is same as sent to you by 7381079 (we share the scale - same problem).