National Instruments provides a number of different solutions to read strain gauges. In order to determine the best solution for you, I would recommend using our on-line DAQ Designer. The DAQ Designer walks you through a series of questions and then recommends a system for your application. The on-line DAQ Designer can be found at:
http://www.ni.com/daq/ddonline.htm
If you have further questions, please contact one of our sales representatives at (512)683-0100.