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The DCMS Downhole Corrosion Monitoring System provides continuous corrosion history of downhole tubing using eletrical resistance (ER) measurement technology. The DCMS™ tool is another Cosasco innovation, and the only tool available which provides recorded corrosion and temperature data for the hostile conditions of downhole operation.  The sensitivity of the system enables the film persistence of inhibitors to be evaluated in actual operating conditions, something that was not possible prior to the development of the DCMS™.