how does this measurement work?

Smartphone based measurement: The majority of current cell phones have computing power greater than personal computers about a decade ago. In addition to high computing power, cell phones have a variety of built in sensors and have several ways of connecting external sensors (e.g. IR camera shown in lecture). Find and describe an app and/or app/phone attachment combo that can be used to do a measurement (this one is open to any time of physical measurements). Please research how does this measurement work? What sensors is it using within the phone? What is the accuracy of the measurement (if it is simple like length, put extra effort and measure it with known quantity)? An interesting topic to research are measurements based on combination of smartphones with DIY 3D printed attachments for various applications.
 

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