First of all, when opening the box one of the arms was damaged and it was not possible to grab two of them. Looking at making, it seems to be weak to the impact, it seems that it got damaged by shock during transportation. I used it as it was because I planned to use it as soon as possible. Although I used it on one side that was safe, I was able to grasp the burette containing chemicals anyway, without any durability, without problems. I think that it is a commodity suitable for the price, but I want to expect durability improvement.