| Model | Range | Test Voltage (DC) | Accuracy | Multiplier |
| PEI - 24 | 10 MΩ TO 200 TΩ. |
100V, 250V, 500 V, 1000V. |
±3% ±3 mm deflection, for last range ±10% ±3 mm deflection. |
1, 101, 102, 103,104, 105, 106,107 |
| PEI - 31 | 1 MΩ TO 50 TΩ. |
50V, 100V, 250V, 500 V, 1000V. |
±3% ±3 mm deflection, for last range ±6% ±3 mm deflection. |
1, 101, 102, 103,104,105, 106 |
| PEI - 34 | 1 MΩ TO 50 TΩ. |
500 V, 1000V. |
±3% ±3 mm deflection, for last range ±6% ±3 mm deflection. | 1, 101, 102, 103,104, 105, 106 |
| PEI - 33 | 1 MΩ TO 50 TΩ. |
500 V |
±3% ±3 mm deflection, for last range ±6% ±3 mm deflection. | 1, 101, 102, 103,104, 105, 106 |