Laboratory Weighing Mass Comparators Manual Mass Comparators Mass Calibration from 0.1 µg up to 6,000 kg. A mass comparator is a balance that offers high resolution and exceptional repeatability, enabling it to be used to determine the smallest differences in mass. Mass comparators are perfect for calibrating and verifying masses and weights in mass metrology. Mass comparators are also ideal for any weighing application that requires highly accurate results. There are many types of mass comparators like Automatic Mass Comparator and Manual Mass Comparator. Advantage of Automatic Mass Comparator is High Accuracy with Low Uncertainty – the fully automated process avoids the need for interaction by the operator during the mass calibration process, providing a higher level of accuracy and lower uncertainty than manual mass comparison procedures.