| Specifications | Range | Best Accuracy | |
| Model | UT501A | ||
| Insulation Resistance (Ω) | Test Voltage | 100V/250V/500V/1000V | 0%~10% |
| 100V | 0.00MΩ~100MΩ | ±(3%+5) | |
| 250V | 0.00MΩ~99.9MΩ | ±(3%+5) | |
| 100MΩ~5.0GΩ | ±(5%+5) | ||
| 500V | 0.00MΩ~99.9MΩ | ±(3%+5) | |
| 100MΩ~5.0GΩ | ±(5%+5) | ||
| 1000V | 0.00MΩ~99.9MΩ | ±(3%+5) | |
| 100MΩ~5.0GΩ | ±(5%+5) | ||
| Load Current | 50V (R=50kΩ) 1mA | 0%~10% | |
| 100V (R=100kΩ) 1mA | 0%~10% | ||
| 250V (R=250kΩ) 1mA | 0%~10% | ||
| 500V (R=500kΩ) 1mA | 0%~10% | ||
| 1000V (R=1MΩ) 1mA | 0%~10% | ||
| Short Circuit Current | <2mA | ||
| AC Voltage (V) | 30V~750V | ±(2%+3) | |