SONEL was established in June 1994 by electrical engineers who had a good knowledge of specialised electrical test equipment. Today they operate from their modern factory and head office based in Swidnica, and have a reputation in Poland as a manufacturer of high quality test equipment .

SONEL aims to make electronic products which meet the requirements for the power generation and telecommunications sectors. Their Test and Measurement instrument range encompasses Power Quality Analysers, Multi Functional Testers, Thermal Imagers, Low Resistance Ohmmeters, Phase Sequence Testers, Wire Tracers, Clamp Meters, Multimeters, Pyrometers, Illuminance Meters, UV Corona Camera and High Voltage Insulation Testers.

Their product range has now expanded to include Cable Fault Location and Cable Fault Detection meters including a DC Hi-Pot Tester, DC Cable Test Sets and VLF Testers.