天平是检验机构化验室最常用的仪器之一。检验工作经常要准确称量样品、药品，称量的准确度直接影响检测结果的准确性和精密度。因此，化验员熟悉和掌握天平的使用和维护方法是十分必要的，同时学会一些天平调修的初步知识，以保证化验工作的顺利进行。现以ＪＧ３２８Ｂ型电光 The balance is one of the most commonly used instruments in a testing laboratory. Inspection work often accurate weighing samples, medicines, weighing accuracy directly affects the accuracy of the test results and precision. Therefore, it is very necessary for laboratory technicians to be familiar with and master the methods of using and maintaining balances. At the same time, we should learn some preliminary knowledge of balance adjustment so as to ensure the smooth progress of laboratory tests. Is to JG328B type electric light