My Garmin Index varies by 1% bodyfat over very short periods of time, which makes me not trust it.
Like one week I’ll be 7.2% and a few weeks later I’ll be more glycogen loaded and more hydrated and I’ll be 8%+. That’s like 1.5lbs of fat with no dietary changes in a week or two. No way.
I haven’t had a dexa scan, but I also suspect I’m not quite that low bf% wise.
But it’s easy to use and syncs to GC which is super nice.