Atomic masses play an important role in nuclear physics and astrophysics. The lack of experimental values for exotic nuclides has triggered a rapid development of new mass measurement techniques at many facilities around the world.

The Time-of-Flight (TOF) technique is one of them. With an access to the most exotic nuclides it is a complementary method to the very precise but more limited Penning trap mass measurements.

The TOF-Brho technique that includes a position measurement for magnetic rigidity correction has been implemented at the NSCL facility. The first experiment, focused on the neutron rich isotopes in the region of Z ~ 20-30, important for r-process calculations as well as for calculations of processes occurring in the crust of accreting neutron stars, has been successfully performed.

An overview of mass measurement techniques and details of the NSCL experiment will be presented. The impact on nuclear structure and astrophysics as well as future plans will be discussed