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An yttrium-aluminum-garnet (YAG) Thomson scattering (TS) system was constructed and applied to the tandem mirror GAMMA 10 device to measure the electron temperature and density. We developped GAMMA 10 YAG-TS system to be able to measure multi-position electron temperatures and densities in a single laser and single plasma shots. The radialy multi-positions electron temperatures and densites are successfully obtained. We show the GAMMA 10 YAG-TS system and the results of multi-position measurements of electron temperatures and densities in the tandem mirror GAMMA 10.