S Tools+ is a pack of 5 different useful tools for your device.
CPU frequency- keep an eye on your CPU frequencies to see at what frequency your CPU was for how much time.
Sensors- A fully featured Sensor manager for your device,see what sensors your device have with a graph showing sensor values and all the sensor details
Color Picker- Color picker helps you in finding all bout colors of an image, just select am image and touch on a point on image to find out color,hexcode and rgb values
Compass-A nice looking compass showing you the directions
Device Information - Find out information about your device like screen density and pixels.
S Tools+ is beautifully designed to help you make use of your device.