ME3840B Low-Frequency meter is an advanced detector to measure the exposure to LF electromagnetic radiation in the frequency range of 5 Hz up to 100 kHz. This device is particularly popular among health care practitioners looking for a competent overview over the total emf-pollution either for themselves or for their patients. It allows an easy allocation of the electrosmog frequencies, generated by transformers, high voltage cables, electrical equipment, home appliances and etc. A switchable internal filter module as in the professional devices, allowing a numeric differentiation of traction power and mains supply as well as the artificial higher frequencies. An acoustic signal proportional to the field strength with “Geiger-counter-effect” helps identifying regions with increased exposure. Digital display shows the total exposure within measured frequency range. The meter is easy to use, designed specifically for non-expert users.