The Android application Metiri was developed during the course TNM094, Media Technology - Bachelor Project. Metiri is the Latin word for "measured" and describes the purpose of the product. The application is a mobile measurement tool that uses augmented reality to measure flat surfaces in real time. It is also possible to measure flat surfaces in stored environments. Metiri has been developed using Google's platform ARCore, the 3D API OpenGL ES and the database library Room. The project was developed using the agile methodology Scrum.