Symbol ( SBL) posted a second-quarter profit and guided to an in-line third quarter Wednesday. For its second quarter ended June 30, the Holtsville, N.Y., maker of bar code and radio frequency identification tags earned $29 million, or 12 cents a share. That's up from the year-ago $7 million, or 3 cents a share, and 2 cents ahead of the Wall Street analyst consensus estimate. Revenue rose to $433 million from $374 million a year earlier. The company forecast that the third quarter would bring a 12-cent profit on sales of $440 million, which is in line with the Wall Street estimate. Symbol shares slipped 18 cents to $12.30.