| Model | 1000V | 2500V | 5000V | |
| IT811+ | IT811 | IT811A | IT811B | |
| Insulation Test Voltage | 100V/250V/500V/1000V | 100V/250V500V/1000V €€ | 250V/500V/1000V/2500V | 500V/1000V/2500V/5000V |
| Insulation Resistance | 1MΩ-2000MΩ | 1MΩ-20GΩ | 1MΩ-20GΩ | 1MΩ-200GΩ |
| Basic Accuracy | ±(3%+5) | |||
| AC Voltage | 1~750V (50-60Hz) | |||

