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We have built up a CPT (Coherent Population trapping) [1] based magnetometer prototype with the D2 line of 87Rb atoms.We have obtained two space-separated and light-intensity-tunable coherent laser beams with a 6.8 GHz frequency difference through a FEOM (Fiber Electro-Optic Modulator) [2] and a CPT resonance signal with 2 kHz linewidth is observed.