These are some parts I designed to be able to mount my multimeter on my desk. I used parts from the excellent Modular Mounting System, designed by yyh1002, and a part from the Modular Mounting System Extensions designed by Inhibit. Thank you guys!
The system consists of a holder tray, in which the multimeter is held, a mounting part which mounts the holder to the other parts of the modular mounting system, and a fixture, which attaches the arm of the mounting system to a wooden beam (44 mm by 18 mm) of my desk. I've included the Openscad files, so that the parts can be customized to your requirements. Printed easily in PLA with supports where needed. The mounting part has to be (epoxy) glued to the holder to form one piece. Used a few parts from yyh1002's system to make the arm & joints & some normal M4 screws to hold it all together.