The Megger 6320 series vessel is available with spherical or cylindrical electrodes, has a 0.5L capacity, is designed for use with the Megger OTS60SX Semi-Automatic Oil Test Set (sold separately), and complies with national test specifications. The vessel with spherical electrodes complies with EN 60156, IEC 156, IJIS C2101, KSC 2101, and NFC 27-131 test specifications. The vessel with cylindrical electrodes complies with VDE0370 test specifications.

Oil dielectric strength tests detect changes in the electrical properties of oil. The electrical properties of oil make it an effective insulating medium and coolant in transformers and other electrical equipment. Overtime, the oil can degrade due to oxidation, acids, sludge, gases, and water absorption, and as a result the desired electrical properties weaken and oil breakdown occurs. The breakdown in the insulating properties of oil is a contributing factor to overall electrical breakdown and transformer failure. Performing oil dielectric strength tests is an important part of maintaining electrical installations.