Ruler

Measurements are wrong Compared it to actual tape measures and this thing is wrong. Because of that I purchased the wrong diameter tubing. An actual inch measures about 1.5" with this app. Fix and I will change rating.

Lock screen doesn't work You can switch between mm and inches, and backlight the screen. It's useful for measuring small items on the screen or holding next to an item to measure it in steps. No permissions is great but the lock screen option doesn't work and it force closes when you press the icon in the upper left. Samsung Galaxy Note II.

Nice... Would be nicer, if I could measure horizontally too

Calibration Calibration is 1.72 on Galaxy Nexus Android 4.1 Jelly Bean

Measurements are wrong! It says the side of my screen is 5 inches long, when it's only a 4.3 inch screen!

Nice Calibration for tabb7.7 = 1.08 Force close if icon on top left is pressed..

Nice.

Galaxy Nexus: calibration 2.278 Work and asks for no privileges

:-D It dosen't have inches

Annoying Hold it up to measure something and the ruler flips to the other side of the phone (even with the "lock screen" option on).