In the end went through the adjusting process 3 times. It Involves bringing the humidity up to 96% by wrapping it in a wet clothe. After first and second adjustment it turned out It was not adjusted as well.
When you are adjusting it, the screwdriver presses on the screw and the needle goes somewhere else than When You Are not pressing it. And in the mean time the humidity is Quickly dropping so it is difficult (almost impossible) to know were to place the needle. So it can be super precise, but if it can not be adjusted well it is no use.
It is built in a cheap plastic case. It therefore has a bonus thermometer. Mine gets stuck and I need to hit the cover with my finger so did it jumps to the right temperature.
I would recommend to find a different product.
