Using Laser level android apps you can check that a photo frame, poster , or clock is straight or not during hanging on the wall.
Download this android apps free from here – laser level
Or you can download this apps from google play store – Laser Level
Laser Level lets you use your Android powered phone’s camera similarly to laser level tool. It also shows angle in degrees. For example, you can quickly see if the picture that is hanging on your wall is straight or not.
– Full Internet access – used by custom error reporting module (works on all Android versions), you can disable it in settings
– Take pictures – needed to show camera preview
– Prevent phone from sleeping – Laser Level will keep your phone awake when it’s running