Is there a floating-ruler app for macOS?

I’m working with a notation software and I would need to space certain graphical elements evenly within a predetermined space (e.g.: I set a 5cm space and I have 5 elements, they need to be precisely 1cm from each other), something that the software cannot do on its own (that is, without printing on paper, measuring, then moving the objects, then printing again and so on...). The ideal solution would be to have a floating ruler on the screen or a superposed grid similar to millimetric paper that would still allow click-through (i.e.: interaction with the program below it). Is there an app that provides this tool? Thank you very much