A Bose-Einstein condensate is used as an atomic source for a high precision sensor. A $5times 10^6$ atom F=1 spinor condensate of $^{87}$Rb is released into free fall for up to $750$ms and probed with a Mach-Zehnder atom interferometer based on Bragg transitions. The Bragg interferometer simultaneously addresses the three magnetic states, $left| m_f=1,0,-1 rightrangle$, facilitating a simultaneous measurement of the acceleration due to gravity with an asymptotic precision of $2.1times 10^{-9}$$Delta$g/g and the magnetic field gradient to a precision $8$pT/m.
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