Unique 50++ Weighing Scales Kmart. These are also known as mass scales, weight scales, mass balances, weight balances, or simply scales, balances. A wide variety of weighing scale kmart options are available to you A beam balance (or beam scale) is a device to measure weight or mass. In our comprehensive weighing scales guide we look at how they work and the different types scales calculate how much something weighs by measuring how much force exists between the.