[EH-M3-b-T375-N375A-316SS-P45] is an Electrode Holder (for users to attach a counter electrode with female thread). It is not a combination ORP / CE. It only accepts one CE electrode with M3 female thread. It does not have a second lead/wire for the ORP electrode (the Pt electrode). The threaded tip is only for the CE.
The proposed Item 6 is shown:
