Disclosed is an aqueous ink composition comprising an aqueous medium and a surface-modified pigment capable of dispersing andor dissolving in water without a dispersant, wherein the composition has a free monovalent anion concentration of 250 ppm or less. The several embodiments provide a comprehensive diagnosis tool for the alignment operation of vehicle wheels by contactless scanning, in particular a real time measuring for total wheel alignment, and enable a respective hassle-free adjustment operation. A lever cover is slidingly mounted on the base. Mounting portions include an opening defining a plurality of pivot axes about which the bail member pivots, each axis oriented at substantially similar heights above the floor. The detection means are disposed at the lower exterior surface of the mobile part. Both of the connection sections include porous members, and supply and receive the ink by a surface contact of the porous members with each other.