Sometimes it is the tools for simple things that are hard to find. Not only that the ones that you do find are not what you want, are not free and might come tangled up with some other nasty apps that you did not count on. Pixel Ruler fills the void of needing to get image sizes just right for your blog or webpage or whatever else you are thinking of.
Pixel Ruler has all the functions that you need. It is small and one of those tools that is good to have because you never know when you might need it. There is not much to it. It works in all applications. You can choose between vertical and horizontal measurement, naturally. There is a maximum measurement of 1300 pixels, but that should cover most possible situations. Not sure why but you can choose between a number of skins as well. This virtual ruler measures in pixels, but as you would know this is preferable to actual size such as mm or cm.
I used to use an actual ruler on the screen to measure the optimal size for images. Might sound stupid, but I did not know this tool existed. It is less important now with the wider body that I have for posts. But larger screenshots on the old theme were a pain, they would not have been with Pixel Ruler.
– Thanks for the Tip Tim