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Brass dial head 40mm dia. on Frame with three legs of stainless steel, Pitch 1mm For accurate measurement of the radius of curvature of spherical lenses. Three-pronged brass table with three pointed legs carries a vertical main scale from 10 - 0 - 10 mm on one of the prongs, and amicrometer scale on a brass disc with 100 divisions. The table has a screw at its center with a pitch of 1mm giving a least count of .01 mm.