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In this paper we propose and verify by experiment a measurement system capable to survey both magnetic (H) and electric (E) fields at the same point, considering that the existing low frequency (50 Hz–10 kHz) instruments permit the survey at two different points, one for H and the other for E. This measurement system has a sensor with a special configuration, with a sensitivity to electric field of 1.3 mV/(V/m), and a sensitivity to magnetic induction of 143 mV/μT. The instrument is suitable for long term survey of low frequency H and E fields by making spot measurements of the fields, both time domain and frequency domain representations of H and E. The correlation between the theoretical analysis of the instrument and the experimental results was very good. The proposed measurement system was used for an automatic survey of background magnetic and electric fields generated by power line in a room from an apartment building. These results are presented in this paper, highlighting the performances of the instrument.