Nextteq LLC, of Tampa, Fla., announces the release of the Gastec Sulfide Ion Detector Tube No. 211. It provides a cost-effective, easy method for detecting sulfide ion levels in a solution. With increased stringency on wastewater regulations, determining a more efficient manner of testing for this compound has become paramount. Direct-reading tubes produce a quantitative color stain that quickly pinpoints problem areas. The calibration scale, printed on each tube, provides on-the-spot results that are easy to read.