Free QR Scanner is a free tool available for Android tablets and smartphones, which can be very handy when looking to read QR and Bar codes. It comes with support for all standard 1D and 2D code types. The big aspect of this application is its intuitive and simplistic user interface. In order to scan a code you will have to launch the app and then use the camera of your device to capture the area where the QR or Bar Code is displayed.
The nice thing is the fact that you don't have to be connected to the Internet while scanning these codes. Another feature is the ability to keep a log of your scans and you can even rename these entries to something relevant. In case you want to read a code in a place where there's not enough light, this application offers support for using the blitz of the camera to provide enough light.
Thanks to its lightweight design, Free QR Scanner is an application which should run fine even on older Android devices that might not have impressive hardware configurations.