The magnetic hyperfine splitting frequency of (BrNi)-Br-82 in an external magnetic field of 0.2 T has been measured by NMR-ON method at 8 mK. The centre of resonance frequency was determined to be 18.7(2) MHz. With the known g-factor of g(Br-82) = 0.3254(1), the hyperfine field of (BrNi)-Br-82 was deduced as B-hf((BrNi)-Br-82) = 7.34(8) T. The measured value is compared with the calculated value based on band structure using bonding states.