The accuracy and precision of the BIA method is affected by the electrode system. Failing to adjust for differences in it may result in systematic biases of up to 5.2%.Forty females ranging from 18 to 24 years, with a body mass index (BMI) of 18.6 to 27.6 kg/m2, were measured by BIA in the frequency range 5 to 500 kHz using the manufacturers recommended electrodes and two types of commercial ECG electrodes (3M-2228 and 3M-2330).The two types of ECG electrodes performed well, but at high frequencies 2330 performed better.It was concluded that when electrodes recommended by the equipment manufacturer are not available, ECG electrodes with the best performance should be used. In this way, it will be possible to predict and prevent inadequate records of electrical signals.