This instrument can be used to measure sound level in various sites, such as factory, school, office, family, and etc. Specification: *Display: 4 digits LCD *Standard Applied:IEC 61672-1 Class 2 *Frequency Weighting: A/C *Measuring Range: A Weighting: 30dB-130dB C Weighting:35dB-130dB *Frequency Range:31.5HZ-8KHZ *Resolution: 0.1dB *Display Update: 2 times/sec *Dynamic Range:50dB *Battery:9V battery, 6F22 or equivalent, 1 piece *Size:193*67*44MM *Weight: about 184G(including battery)