Bioelectric Impedance or BI is a technician attaches electrodes to one hand and one foot, and a harmless radio-frequency pulse is run through the body to measure its water content. That number provides a guide to body fat with an error of 2 or 2 1/2 percentage points. But exercise and liquid intake before the test can skew results. Trying BI ( Bioelectric Impedance ) must have some equipment required, read full article here. This testing have disadvantages and advantages too.
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