Model | NM14 | NM24 | NM34 |
| Measuring Range | 30～130dBA, 35～130dBC | ||
| Accuracy | ±1.5dB | ||
| Frequency | 31.5HZ-8.5KHZ | ||
| Dynamic Range | 50dB | ||
| AC/DC Signal output | √ | ||
| Automatic power-off | √ | ||
| Low-power display | √ | ||
| Overload alarm | √ | ||
| Digital bit and resolution | 5Digits & 0.1dB | ||
| Selection of Dynamic feature | Fast/Slow | ||
| Microphone | 1/2 inch Condenser Microphone | ||
| Frequency weighting characteristics | A & C | ||
| Selectable measuring level | √ | ||
| Maximum value lock | √ | ||
| RS232 interface | – – | √ | |
| Perpetual calendar | – – | √ | |
| Sampling frequency | 2 times/sec | ||