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Loss of energy in Standard Penetration Test (SPT) activities, which is mainly caused by many variables (e.g. hammer type, system, test depth, rod length, operator judgment, and other factors) can affect the number of blow required to penetrate the soil. This may cause inacurracy in determining soil shear strength. To minimize this error, we conductSPT Analyzer, based on ASTM D 4633, for measuring SPT hammer energy in order to correct N-SPT value obtained in field.