BitRule 1.1 is a Desktop Utility product from charten.com, get 4 Stars SoftSea Rating, BitRule is a free screen measurement tool
It is much easier to use than other screen rulers and screen calipers.
Just click on two points on your screen, and get the horizontal, vertical and diagonal distances, as well as the angle to the horizontal.
BitRule measures in pixels, inches, centimeters and picas.
The built-in magnifier makes extremely accurate measurements possible.
To use BitRule simply: click on first measurement point
click on second measurement point
Note: as your computer does not know the physical dimensions of your monitor, it may be necessary to perform a very simple calibration if you need exact inch, centimeter or pica measurements:
place a ruler horizontally against the screen
using BitRule, measure between two points on the ruler (for example click beside "0" inches (cm) and then 10 inches (30cm) on the ruler)
if the BitRule measure differs from the actual measurement, then click on the Calibrate button (next to the Help button), and increase or decrease the resolution until the measurements agree. The license of this windows utility software is Freeware, you can free download and free use this Windows Utility software.