So light I thought they were plastic. Moves and slides across the counter if not very carefully. In fact, it can also turn around. Not for intensive use. Not for students working alone, unsupervised. Disappointing. Also, measuring out a dozen chemicals in small separate containers doesn't balance the scales to zero. You can't bring the scales to zero. Therefore it is impossible to take into account the weight of any containers. Not for use by students in the classroom, not for my use in…