An improved pyroconductivity test device, consisting of a specially constructed airtight furnace and a potentiostat, was constructed based on the conventional direct current fourelectrode technique. Symmetrical current distribution in the specimen was obtained by keeping a fixed pressure and good electrical contact between the specimen and the electrodes at any temperature. The potentiostat was used to supply direct current and continuously monitor the current intensity and voltage drop, which could be adjusted outside the heating furnace to give good contact with the specimen. Test results of graphite specimens showed that the reliability and reproducibility were excellent. The electrical conductivity as a function of temperature for various spinel-containing cermet inert anodes was investigated, spanning the Hall-H