Samsung has loaded its SIII and Galaxy Note series of mobile phones with an amazing feature to test the functionality of the hardware directly thereby skipping the software.
Follow the codes below for hardware self test
TEST ONE for color, camera, sensor, vibration, speaker, S-Pen, touch and other
TEST TWO for Bluetooth, Vibration, Dimming, Camera, proximity Sensor and other
TEST THREE for Battery
It gives details regarding battery charge condition, current value and average value of voltage & temperature and others.