Hygrometer Case

Hi guys!!! Since I started 3D printing, I started to be afraid of humidity and of course I have a lot of hygrometers around. So why not create a case to keep my hygrometer in a useful location? Like on top of my 3D printers? So I created this design that can hold each hygrometer (rectangular) on a metal shelf. I hope you will find the design useful and of course let me know if you like it or how can I improve it. Thank you and happy printing!