Instruct: Classify a given review as either positive or negative.
Query: Disappointing Performance

I've had this scale for a few years now and I've just come to expect to see a different reading each time I step on the scale. I have to take a few readings and average them. Sometimes the difference between one weighing and the next is as much as four pounds.Also, the scale supposedly has a "fat analyzer" feature, but I was just looking at it a moment ago, and I have no idea how to activate this feature. I can set up to 10 separate users, entering age, height, sex, and "fit level" for each, but there's no mechanism I see for having the scale analyze anything except my weight (which it does poorly, as I mentioned).The last straw for this scale was my recent visit to my doctor's office. They had just installed a new digital scale, and according to it, my Salter was registering 15 pounds under the actual weight. Considering that there's no obvious way to adjust this digital scale, that's just too much.