Determine the smallest increment of strain hat, Mechanical Engineering

A 16-bit A/D board is arranged to accept voltage signals ranging from -5V to +5V.  The A/D board is used to monitor the output from the Wheatstone bridge shown below.  The strain gage used has a gage factor of 2.15 and a resistance of 120?.  What is the smallest increment of strain hat can be sensed with this arrangement?  Ignore transverse sensitivity and leadwire effects.

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