Instrument calibration is one of the primary processes used to maintain instrument accuracy. Calibration is the process of configuring an instrument to provide a result for a sample within an acceptable range. Eliminating or minimizing factors that would cause inaccurate measurements is a fundamental aspect of instrumentation design. Although the exact procedure may vary from product to product, the calibration process generally involves using the instrument to test samples of one or more known values called “calibrators.” The results are used to establish a relationship between the measurement technique used by the instrument and the known values. Computerized Maintenance Management Systems are increasingly being used to manage and control plant and equipment maintenance in modern manufacturing and service industries. Computerised systems are now being installed in preference to the manual (paper based) preventive maintenance systems that have been around for many years. In recent years’ private companies have come to recognize the value of these systems as a maintenance performance and improvement tool. The main objective of this project is to automate the calibration process with help of Calibration Software in TPS-1, EXPN, NLC India Ltd., Neyveli. In present situation, the calibration and data entry are done manually. This automated system of calibration will increase the accuracy of calibration, time management and less human employment. The miniature of automated calibration system and data entry is actually done with the help of Arduino Software.