Ruler app is designed to take object size and measurement by clicking a photo of the object or measure it on the screen. 1) Line - allows to tape measure linear sizes in cm, m, ft, yd, apply mm ruler or inch ruler. 2) Distance meter - allows to tape measure distance from the device camera to a fixed point on the detected 3D plane. 3) Angle - allows to tape measure corners on 3D planes. 4) Area and Perimeter. 5) Volume – allows to tape measure size of 3D objects. 6) Path - allows us to calculate the length of the path. 7) Height - allows to tape measure height relative to the recognized surface.