Allowing measurements up to 2,000 mG to 200 micro-tesla with basic accuracy of 2.5% + 6-digit, Model HHG191 can measure electromagnetic fields of low frequency (30–300 Hz) of electric transmission equipment, microwave ovens, air conditioners, computer monitors, and video/audio devices. With overload display, low battery indicator, and micro-tesla and milli-gauss display options, it is designed for air shipment, medical manufacturing, and oil industries.