This is perfect..
http://www.ebay.it/itm/HX711-Weighing-Sensor-Dual-Channel-24-Bit-Precision-A-D-Module-Pressure-Sensor-/161264280835?pt=LH_DefaultDomain_0&hash=item258c19a503&_uhb=1
HX711 library in github for arduino..
Bye
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