Smartsensor AS804 数字噪音计（30~130 dBA;±1.5dB）

Microphone: 1/2 inch Condenser Microphone   

Measuring Level: 30~130 dBA 

Accuracy: ±1.5dB 

Frequency Range: 31.5HZ~8.5KHZ

Frequency Weighting: A 

Level Range Bar Graph: no 

Range Selection: no

Range Over Indication: no

Battery Indication: yes 

Backlight Display: yes 

Max & Min Hold Function: yes  

Digit & Resolution: 4 digits & 0.1dB 

Time Weighting: no

Auto Power Off: yes 

External power supply: yes 

Sampling Frequency: 2 times/sec 

Power: 3x1.5AAA battery 

Dimensions: 155*50*25mm 

Weight: 75g

Datasheet