Langmuir probe data were measured in the edge of the central cell plasma of the Hanbit magnetic mirror device. The data were obtained during radio frequency discharge plasma operation. Up to 200 kW heating power was applied at 3.75 MHz. Ion saturation current measurements from three fixed probe arrays were made for intercomparison of the edge plasma density profiles. In addition, measurements of the electron temperature, electron density and floating potential were made in a radial scan of the edge plasma using a movable triple Langmuir probe. The experimental results from these probe measurements are described.