Abstract: The primary charge roller evaluator is a device to determine an accurate measurement of conductivity or leakage current of primary charge roller, from its steel shaft to outer coating. This measurement is based on the impedance of the roller, that is the in-phase resistance and the capacitive reactance of the roller. This measurement allows the user to evaluate the quality of the primary charge roller. This evaluation is then used to predict the performance of primary charge roller. Accurate conductivity or leakage currents are determined by totally enclosing the primary charge roller in conductive holders and applying a pre-measured pressure on roller for maximum contact. Humidity compensator adjusts for changes in humidity and has non-linear scale to adjust for patented characteristics of rollers.