Measure objects on your screen, even between very fine points, with A Ruler for Windows
A Ruler for Windows is a free and easy to use program that will let you measure in pixels whatever distance on your screen. You have an appearance choice of rich wood grain, stainless steel, clear plastic see-through or yellow construction ruler.
A Ruler for Windows lets you layer one or more rulers on your screen at once. It can also be flipped horizontally or vertically, resized to an exact length or resized by dragging it to a desired length.
Numbering can be reversed and the ruler length can be toggled on and off. Ticks can be placed on whatever edge you prefer. You can click on a tick to have a measuring line automatically drawn at an exact location. Special 2x, 3x, and 4x modes allow you to take a snapshot of your primary screen and magnify it to more easily measure between very fine points.