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The Stern Geary approximation method of monitoring corrosion is a wellestablished accelerated method in conducting media. The impedance method of monitoring corrosion is also very much in use. However, the Stern Geary method seems to be unsuitable in highly resistive media like concrete. An instrument has been designed to measure the polarization resistance of steel after eliminating the concrete resistance. A special probe has also been developed for this technique. Previous work in this area, confined to instruments of lower current capability, was carried out by the authors and patented III. Now there is a demand for an RCC monitor with high current capability enabling studies on a larger area of the sample. The instrument reported in this paper is capable of supplying currents of up to 500mA with high precision and makes it possible to monitor the corrosion rate of steel in concrete.