This rangefinder measures the distance and height of an object with your mobile device using the laws of trigonometry. All you have to do is aim at the object and press the trigger button. It is important that you aim the camera at the base of the object. (That is, to measure the distance to a person, you should aim at his shoes.) Please read the instructions for the program or use the help on the main page. This app has been downloaded 10.0 million times and supports 12 languages. The operation of sensors in your phone depends on the operating system version, firmware and battery status. In order to get an accurate result, you may need manual calibration. The latest version of the app Rangefinder - Smart Measure download for android.