Ruler app camera tape measures this app very use full for Architect, Interior designers, a civil engineers. In this app amazing features. Photo Ruler app is designed to accurately tape measure the size of any object by either taking a picture of it or measuring it on the screen. Photo Ruler app allows you to measure things just as conveniently and precisely as with a traditional mm ruler or tape measure tool. 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 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 calculating the length of the path. 7) Height - allows to tape measure height relative to the recognized surface.