| MODEL | 3121 | 3122 | 3123 |
| DC Test Voltage | 2500V | 5000V | 5000V | 10000V |
Measuring Ranges (automatic change) | 2GΩ/100GΩ (autoranging) | 5GΩ/200GΩ (autoranging) | 5GΩ/200GΩ (autoranging) | 10GΩ/400GΩ (autoranging) |
First Effective Measuring Ranges Accuracy | 0.1 - 50GΩ | 0.2 - 100GΩ | 0.2 - 100GΩ | 0.4 - 200GΩ |
| |±5% rdg |
| Other ranges Accuracy | |±10% rdg or 0.5% of scale length |
| Withstand Voltage | 5000V AC for 1 minute |
| Power Source | R6 (AA) (1.5V) × 8 |
| Dimensions | 200(L) × 140(W) × 80(D)mm |
| Weight | 1kg approx. |
| Accessories | 7058 (Test leads) 9039 (Carrying case [Hard]) R6 (AA) × 8 Instruction Manual | 7058 (Test leads) 9039 (Carrying case [Hard]) 8019 (Hook type prod) R6 (AA) × 8 Instruction Manual |
| Optional | 8019 (Hook type prod) 8020 (Adaptor for recorder) | 8020 (Adaptor for recorder) |