I wasn't expecting anything incredible from this scale, given that it costs such a small amount of money compared to any comparable scale that I could find online after a quick search; nevertheless, it was a fairly disappointing purchase.
It is clear that this scale is not very precise. I tested its precision by keeping it in the same position and weighing the same object a number of times, without turning the scale off. Then I tried weighing an object, taking it off the scale, turning the scale off, then turning it back on and weighing the same object again. If you take an object off the scale and then put it back on in about the same place, without turning the scale off, you will usually get approximately the same reading. If you turn the scale off between measurements, however, you will most likely get a significantly different reading each time. For my purposes it was important to get a reading that was accurate to the milligram, which is the smallest increment measurable with this scale. In one instance, I weighed the same object twice and the difference in weight between each reading was 12 milligrams - quite a significant difference. Additionally, If you put an object on the scale and move its position even slightly, you will get a different reading. (I calibrated the scale properly, according to the instructions, before I tried measuring anything; so proper calibration was not the problem).
If it is not very important to you that your measurements be precise to the milligram, but it is very important to you that you not spend very much money, then this scale may work for your purposes, given that it is so relatively cheap.