The Radiometer PHC3006-9 Combination pH Electrode has a glass body, Ag/AgCl reference system, refillable electrolyte (3M KCl + sat. AgCl) and porous pin junction. The PHC3006-9 has a long length of 150 mm with lower diameter of 6.5 mm for general purpose or semi-micro applications. The PHC3006-9 is a screw cap electrode and requires the CL114 cable (part no. A94L114) for compatibilty with Hach sensION+ benchtop pH meters (or any meter with a BNC connection).