| Model | Description |
|---|---|
| GD-1 | Flow through electrode holder for 1 GEL Electrode |
| GD-43 | Standard flow through electrode holder for up to three electrodes |
| GD-154 | Flow through electrode holder for membrane covered Oxygen electrodes |
| GE-24-3 | Immersion electrode holder for double measurement |
| GE-22-P | Immersion electrode holder for up to four electrodes |