Reloaders rely on their powder scales to accurately weigh safe powder charges and check the charges thrown by their powder measures. the RCBS Reloading Scale Standard Check Weights Set allows correct readings that are essential to safe reloading.Over time accumulated grit and dust can affect accuracy. A quick test with RCBS Scale Check Weights will tell you if your scale is reading correctly. Sets include: Standard set ( Item RC98991) of 60.5 grains for powder charges (2x20 1x10 1x5 2x2 1x1 1x.5). Deluxe Set ( Item RC98993) of 510.5 grains for bullets cases and powder (1x200 2x100 1x50 2x20 1x10 1x5 2x2 1x1 1x.5 1 forceps).