people use either calipers or a bioimpedance device. the former can be relatively accurate-ish if done well and consistently, the latter is wildly fluctuating based on a lot of factors (mainly water in your body), but can be used to gauge an estimate. Both are useful in a general sense for trending and seeing improvement long-term, than for actual "this is my true bodyfat" knowledge.
My caliper tests were always pretty consistent, but if using the scale with bf measurement (bioimpedance) I easily get a 5% range from day to day.
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