I bought a few of these dish stands from Daiso and use them as laptop, phone and iPads stand for saving up some desk space.
It is made of wood with very simple and sturdy design. There are some other metal ones, but this wooden one seems not hurting the electronics outside coating. It holds my iPad, a bulky Windows laptop, and 2 MacBooks together nicely :-)
Those looks like it could be used for test tubes as well