[John Peterson] created this postal scale device for a Renesas design contest. The Weasure not only calculates the package’s total weight but the dimensions as well. He built it using a ...

Hold and Tare: It will retain the number on the screen after pressing the H button, even after taking the package off the digital postal scale. The T button can zero out the weight of the ...

These letter scales were used to determine postal rates according to weight. It's interesting to note that the postage rates were stamped in brass leading one to believe that rates were fairly stable.