| Electrode Model | Class | Use with these Housing Models | Electrode Length | Cable Length | Connector | Electrode Part Number |
| Model F-635 pH FermProbe with Standard Metric Cap | ||||||
| F-635 | D | 325, 335 | 120 mm | Order Separately | F-635-B120-DH | |
| F-635 | F | 325, 335 | 200 mm | F-635-B200-DH | ||
| F-635 | X | Extended lengths for use with: compression fittings or thread directly into vessel’s headplates Many other lengths available, call factory for information. | 225 mm | F-635-B225-DH | ||
| F-635 | X | 325 mm | F-635-B325-DH | |||
| F-635 | X | 420 mm | F-635-B420-DH | |||
| F-635 | X | 480 mm | F-635-B480-DH | |||
