Use for temperature compensation with any pH electrode without built-in ATC (Automatic Temperature Compensation). A separate temperature probe offers faster temperature response and lower pH electrode replacement costs. For use with Eutech or Oakton meters: pH 5, pH 6, Ion 6, pH 11, pH 110, pH 510, Ion 510, pH 1100, pH 2100, pH 5+, pH 6+, Ion 6+, pH 700, Ion 700, pH 2700 and Ion 2700.