Which digital scale to use?

All digital scales are not the same. Some scales rely on a single load cell. Others have multiple load cells and take the average of those cells to determine the weight. You should look for a scale that has the load cells mounted to the feet (like the black one in the photo). The silver one has a single load cell and will not give consistent readings when you apply concentrated loads on the measuring surface. Walmart and other stores sell the black style scale. It’s what we use…..