To perform a routine test on your balance, we recommend using two weights. A CarePac contains two weights, which were pre-selected for your balance. A CarePac is designed to save space and to protect the weights. Additionally, it includes a special brush and a cloth to remove possible contamination from the weights, as well as a pair of tweezers to conveniently and safely lift the weight and place it on a balance. A CarePac has space to accomodate an additional third weight, if necessary.