*This unit was designed according to following standards:
----A. International electrician committee standard: IEC PUB 651 TYPE2
----B. US national standard: ANSI S1.4 TYPE2
*Measuring range: 30~130 dBA
*Accuracy: ±1.5 dB
*Digit & Resolution: 4 digits & 0.1 dB
*Frequency response: 31.5Hz ~8.5KHz
* Frequency weighting characteristic: A
*Sampling rate: 2times/second
*Microphone：1/2 inch polarization capacitance microphone
*Max reading
*Automatic backlight
*Low battery indication
*Automatic power off

*Packing method: Blister + Card
*Power: 9V battery (6F22)
*Dimension: 57*36*149mm
*Weight: 144g (including battery)

Packing:

60PCS, 48*47*40CM, 12KG