《砝码检定规程JJG 99-72(试行本)》中规定:一等砝码以工作基准砝码在3级天平上用组合比较法检定。二、三等砝码的检定均与高一等标准砝码比较,并按全国质量量值传递系统在相应精度的天平上进行比对。因此,大多数不具备公斤组一等砝码的单位,对公斤组的二等砝码,则须送上一级计量部门进行检定。但是,当具有1kg一等砝码时,是否可以 “JJG 99-72 test procedures (trial version)” provides: first-class weights to work on the basis of weight balance on the 3rd class by the method of comparison test. Second, third and so on the weight of the test are compared with the first-class standard weights, and according to the national mass transfer system in the corresponding accuracy of the balance for comparison. Therefore, most of the units that do not have the first-class weight in the kg group must submit the second-class weights to the kg group to the first-class measurement department for verification. However, it is okay with 1kg first weight