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An insertion device (ID05) of the SPring-8 diagnostics beamline II (BL05SS) was characterized from the aspects of both the magnetic field performance and the spectral performance as a high K wiggler, which was confirmed to have the field performance with the rms phase error less than 2 degree. Meanwhile, the spectral performance of ID05 as an undulator with small K was also investigated by the energy spectrum measurements. The rms phase error less than 2degree leads us to apply the wiggler radiation on the higher harmonics to the beam diagnostics. We successfully demonstrated an application to the energy-spread diagnostics of electron beam using the 19th harmonics. [ABSTRACT FROM AUTHOR]