Do I need an 8-electrode scale instead of a standard foot-only one?

Eight-electrode scales (with handles) send current through both arms and legs, which expert reviewers at PCMag note correlates more closely with DEXA than foot-only models. Specialist subreddit users echo this but caution that the absolute numbers are still off — the upside is more stable, segmental data. If you only care about weight trend plus a rough fat/muscle estimate, a 4-electrode foot scale is plenty.