Sonel S.A. is a company that manufactures electric test equipment and measuring instruments for electrical power applications: * short-circuit loop impedance, * earth resistance and soil resistivity, * insulation resistance, * protective residual current devices, * small resistances, * current, voltage (multimeters, current clamps), * safety of electrical devices (PAT), * power quality analyzers, * devices for locating cable routes, and non-electric: * non-contact temperature measurement (thermal imagers, pyromethers), * illuminance measurements.