yes it's for arduino. I use many sensors and they works propely only if the system il supplied in the right range. Reporting arduino uno specs http://arduino.cc/en/Main/ArduinoBoardUno
"The board can operate on an external supply of 6 to 20 volts. If supplied with less than 7V, however, the 5V pin may supply less than five volts and the board may be unstable. If using more than 12V, the voltage regulator may overheat and damage the board. The recommended range is 7 to 12 volts"
If I give arduino only 5V my measures can be affected by an error. For example try to measure an analog temperature if you're under 7V and if you're in the 7-12V range. The value red will be very different. Anyway you're right, I can check out for a "9v boost-up", I only need to check if the value of ampere (max A)after this stuff would be ok for my system. Thanks