Smart Measure Pro is the 2nd set of Smart Tools® collection. This range-finder (telemeter) can measure the Distance, Height, Width and Area of a target using trigonometry. Usage is simple : Stand up and press the shutter. The important point is that you must aim your camera at the GROUND, NOT the object. (i.e. In order to measure the distance from someone, aim at his shoes.) After pressing the height button, measure your friend's height. If it is not accurate, please read the instructions and see checklist diagram in my blog. You can calibrate this app with calibrate menu for yourself. * Pro version added features: - No ads - Width and Area - Portrait mode - Camera Zoom * 3 tools for distance were completed. 1) Smart Ruler (short, touch) : 1-50cm 2) Smart Measure (medium, trigonometry) : 1-50m 3) Smart Distance (long, perspective) : 10m-1km * Do you want more tools? Get [Smart Tools] package. For more information, watch YouTube and visit the blog. Thank you. * It is a one-time payment. The app price is charged only once. ** No internet support : You can open this app without any connection. After installation, open the app 1-2 times with your device connect to WI-FI or 3G/4G.