Plug in line (old model)
| Model name | Technical parameters | Description | Electrode plugs |
| PCI-1 chloride electrode | 10-1~5×10-5 | pH, Ion Meter | Straight in |
| PCa-1 calcium ion electrode | 10-1~10-5 | pH, Ion Meter | Straight in |
| PBF4-Type 1 fluoroborate ion electrode | 10-1~3×10-6 | pH, Ion Meter | Straight in |
| PK-1 potassium electrode | 10-1~10-5 | pH, Ion Meter | Straight in |
| PNO3 -Type 1-nitrate ion electrode | 10-1~10-5 | pH, Ion Meter | Straight in |
| PCIO4-Type 1 perchlorate ion electrode | 10-1~5×10-6 | pH, Ion Meter | Straight in |
| PAg/S-1 silver-sulfide ion electrode | 10-1~3×10-7 | pH, Ion Meter | Straight in |
| PPb-1 lead-ion electrode | 10-1~5×10-7 | pH, Ion Meter | Straight in |
| PCN-1 cyanide ion electrode | 10-2~10-6 | pH, Ion Meter | Straight in |
| PI-1 iodine ion electrode | 10-1~5×10-7 | pH, Ion Meter | Straight in |
| PCu-1 copper-ion electrode | 10-1~5×10-7 | pH, Ion Meter | Straight in |
| PBr-1 type bromide ion electrode | 10-1~5×10-6 | pH, Ion Meter | Straight in |
| PF-3 fluoride ion electrode (glass) | 10-1~10-6 | pH, Ion Meter | Straight in |
| PF-2 Fluoride Ion Electrode (Plastic) | 10-1~10-6 | pH, Ion Meter | Straight in |
| PNH3 -Type 1 ammonia sensitive electrode | 10-1~5×10-6 | pH, Ion Meter | Straight in |
| 6801 (zero potential 0) sodium ion electrode | 0-6pNa; Solution temperature: 20-40 °C | DWS-51 pointer | Straight in |
| ORP electrodes for soils | ±2000mV,5-60℃ | 1 extension rod included | / |