Who Invented the 12 Inch Ruler?
I agree with the author above, the first ruler was really invented in 1675. The author unfortunately is not known, but he made a huge contribution to the world of science. It is possible to say that it is impossible to do anything without measurements. A ruler is necessary in every sphere of life, whether at home or somewhere on a trip. So I always use it too, but I do not carry it everywhere, it is enough for me this application, which can be downloaded from this site. I recommend it, it’s really handy, in any situation, you open the app and measure the desired length and latitude.