SMARTSENSOR AS824 数字噪音计 (30-130dBA, 35-130dBC, ±1.5dB)

Specification: 
- Measuring range: 30-130dBA, 35-130dBC 
- Accuracy: ±1.5dB 
- Microphone: 1/2 inch electret condense microphone
- Frequency range: 31.5Hz~8.5KHz 
- Linearity Range: 50dB 
- AC/DC output interface: yes 
- Over range indication: yes
- Max reading hold function: yes 
- Low battery indication: yes
- Power auto shut off : yes
- Power: 4*AA Battery
- Product Size: 265*70*35mm