The versatile polarographic electrode is easy to use and maintain. Screw-apart construction lets you quickly change from one cable length to another or replace either probe or cable without replacing the entire assembly. Automatic pressure compensation corrects for hydrostatic pressure. A guard protects the sensing elements and rugged construction withstands extreme environments. The built-in weight reduces current effects. For measuring in shallow water where hydrostatic pressure compensation is not required, use a O6071 (YSI 5718) Probe with 12-foot cable (3.7 m). O6070 (YSI 5739) Requires a O6120 cable. Both probes include a O6150-1 (YSI 5775) Membrane Kit.