| Model | Max. Output AC Voltage | Output AC Current | Max. Output DC Voltage | Output DC Current | Additional Measurements |
| GPI - 625 | 5.0 kV | 100 mA | ? | ? | ? |
GPI - 825 | 5.0 kV | 100 mA | ? | ? | output voltage, resistance, resistance accuracy | GPI - 826 | 5.0 kV | 20 mA | ? | ? | output voltage, resistance, resistance accuracy | GPI-5005T | 5.0 kV | 10 mA | ? | ? | ? | GPT - 815 | 5.0 kV | 100 mA | 5 kV | 100.0 mA | ? | GPT - 805 | 5.0 kV | 100 mA | ? | ? | ? |