Scientist conducts experiments in laboratories by using instruments. So, instruments or devices play a major role in providing results for the experiments conducted. As the result the devices should be maintained in a proper condition to get accurate results. So calibrating instruments becomes an essential need in the part of laboratory program. The devices calibrated will be proved to provide correct results without any deviations. The test results will match with the samples after calibration is performed. Calibration needs to be done to instruments periodically to make sure the instruments are in the working condition. Calibration: The first step for an instrument to maintain accuracy is the process of calibration. Calibration is nothing but the process involved in arranging an instrument enabling it to get accurate results with the compared standard samples. The main aspect of the calibration process is to delete or decrease the factors which are causing incorrect results. However the calibration process may vary based on the product and their function. Basically calibration refers to testing of samples with standard values in an instrument or system. The results obtained from the testing helps to maintain a relationship within the instruments by making adjustments if required to meet the standards so that the instruments will provide more accurate results. The process of conducting calibration is important for an apparatus. Calibration ensures proper working condition of the device and promises accurate results. Calibration should be done properly without any deviations. There are some factors affecting calibration. They are as follows Use of wrong calibrates values: instructions mentioned for the calibration process should be followed correctly by using correct calibrator values. Selecting wrong calibrator values will result in instrument errors throughout the operation. Software detectors are available in some instruments which will ensure the incorrect order of calibrator values are alerted to the operator. Ambient temperature effect: It is important to conduct calibration for instruments on periodic basis at a operated temperature. Still some factors may affect the accuracy such as ambient temperature where errors are made while testing the samples with unknown values and may not be identified at that time. Advantages: The advantages of accredited lab equipments calibration services are as follows Strict adherence to high standards: In order to develop and execute quality management system the lab services follows standard assessment procedures to comply with the standards. Unmatchedaccuracy: An independent third party will test and verify the traceabilityand accuracy proficiency of the calibration lab services. Monitoring: while choosing lab calibrating services for calibrating an instrument the organization can get a level of comfort due to the third party check conducted by the lab services. Cost: After conducting instrument calibration by lab calibrating services the organization can be confident enough as the procedures followed will be accurate resulting in cost reduction.