Sension+ 9660C is a combination calcium ion selective electrode (ISE) with an epoxy body, non-refillable, double-junction reference, and non-replaceable, solid-state PVC (polymer) membrane selective to calcium ions (Ca2+) in solution. The 9660C has a fixed 1 meter cable and BNC connector for laboratory use with the Hach Sension+ MM340 GLP pH/ISE Laboratory Meter, the Sension+ MM374 Laboratory Multimeter and Hach TitraLab Titrators. The 9660C is ideal for measuring calcium concentrations in drinking water, wastewater and general water quality laboratory applications.