ASTM E898-88 (2013) Standard Test Method specifies the technical requirements and operating procedures for testing top loading, direct reading laboratory scales and scales. The standard is mainly applicable to various top loading scales and scales used in laboratories, especially instruments with direct reading function. The standard covers the equipment, steps and calibrating procedures required in the testing process, aiming to ensure the stability of the performance of the weighing equipment in the laboratory and the accuracy of the result measurement. Through detailed testing of the accuracy, Sensitivity, Repeatability and weighing range of the scales, it is guaranteed that they meet the relevant quality control requirements. This test method is essential for weighing in a laboratory environment, ensuring Reliability of data in scientific experiments and mass inspections.