The purpose of the scale is quick and accurate weighing; many times it jumps 0.3-0.5 up and down in fluctuations, while at other times nothing changes even after you have added or removed something for several seconds afterward. Generally, if you don't get the exact weight on the first weighing, you need to reposition the filter to ensure it sees the difference. Other times, without making any changes to what is being weighed, the weight changes after a while. I wasted time, nerves, and coffee with this thing for no reason because the supplier brought it to me as standard; another silly thing they charged me for was a large ice keeper without insulation made of thin plastic. If you are starting coffee now, be careful with these things. The garbage that comes out is overpriced.