Sension+ 9663C is a combination ammonium ion selective electrode (ISE) with an epoxy body, non-refillable, double-junction reference, and non-replaceable, solid-state PVC (polymer) membrane selective to ammonium ions in solution. The 9663C has a fixed 1 meter cable and BNC connector for laboratory use with the Hach Sension+ MM340 GLP pH/ISE Laboratory Meter or the Sension+ MM374 Laboratory Multimeter. The 9663C is ideal for measuring ammonium concentrations in drinking water, wastewater and general water quality laboratory applications.