[FREE APP, no ads] MilliMeter - screen ruler

[solar_fan]

Free, simple and easy to use screen ruler for Android. Any device can be calibrated and no ads:
https://forums.androidcentral.com/e...com.vistechprojects.millimeter&token=Sq7eizPC

 

[vtprojects]

Pro version includes some extra features.

 

[vtprojects]

Millimeter Pro is also available on iOS now.
Split small objects and make measurements on your screen: size, area, angles, ratio.

http://itunes.apple.com/app/millimeter-screen-ruler-on/id631810777?mt=8&at=10l3Vy