1)   Screen Calipers 4.0 The Screen Calipers are the unique on-screen measurement tool, that let you measure anything on your computer screen with ultimate accuracy. The Screen Calipers floats above any other application so you can measure anything on your screen. 2)   Screen Calipers Mac Edition 3.2 The Screen Calipers are the unique on-screen measurement tool, that let you measure anything on your computer screen with ultimate accuracy. The Screen Calipers floats above any other application so you can measure anything on your screen.