| Item | Technical Specification |
| Range | 30-120dB |
| Accuracy | ±1.5dB (2Khz80dB point correction) |
| Resolution | 0.1dB |
| Frequency response | 35Hz – 20kHz. |
| Frequency weighting | A |
| Supply | 5VDC,12VDC,24VDC |
| Output | RS232 , RS485 |
| Response Time | <2s |
| Operating Temperature | -20℃-+60℃@10-90%RH |
| Storage | -20℃-+80℃@10%-90%RH |
| Shell Material | metal |