  We report frequency measurement of the clock transition in an 115In+ ion
sympathetically-cooled with Ca+ ions in a linear rf trap. The Ca+ ions are used
as a probe of the external electromagnetic field and as the coolant for
preparing the cold In+. The frequency is determined to be 1 267 402 452 901
049.9 (6.9) Hz by averaging 36 measurements using an optical frequency comb
referenced to the frequency standards located in the same site.
