The task handled by this application is revealed inside its title. QR Code Reader is a lightweight tool capable of scanning any QR code you run into. Just as expected, the app provides a simple interface in which you can use the built-in camera of your device to scan these codes. As soon as you do this task, the content will be displayed inside the window.
The QR codes supported by this piece of software are: Quick Code, EAN8, Code39, QRCode Data Matrix, EQS and Code128. There are some options available inside the interface such as copying the text, send using email, share with other people and search for it using the Google Search Engine. Othere than that there's not much else to say. The application is quite small and it should run fine even on Android devices that are not that powerful with regard to hardware specs.
Just be sure the camera works well because this is the main way of feeding the QR code to be decrypted.