APERA INSTRUMENTS 201DJ-C Double-Junction Combination pH Electrode is ideal for long time consistent testing in turbid water solutions, such as wastewater, pools and spas, and environmental monitoring. Its double-junction structure prevents the probe from being clogged and contaminated during measurement. Measurement Range: 014 pH, 080?C (32176?F); Housing: Polycarbonate; Junction: Double Ceramic; Reference Electrode: Ag/AgCl; Connector: BNC; Size: ø12 160 mm; Cable: 3 Ft. Not suitable for testing in low-ion concentration solutions (eg: deionized water or distilled water), strong base solutions (pH>12), highly corrosive liquid, or for continuous testing in high temperature solutions (>140?F). Compatible with any pH meters that use BNC connectors. Temperature sensor is not built-in. Users need to have a separate temperature probe to enable ATC or manually input temperature to complete temperature compensation