Product description: Quantity: one piece Measurement range: 30~130dBA Accuracy: 1.5dB. Frequency response: 31.5Hz~8kHz. Resolution : 0.1dB. Operating temperature and humidity: 0~40, 10~80% RH Storage temperature and humidity: -10~60, 0~90% RH Power Source: 3 x 1.5V AAA batteries (included). It is a perfect sound level meter for measuring noise levels in homes, factories, offices, theaters and audio systems. Digital Sound Level Meter measuring range: 30~130dBA; Accuracy: +/- 1.5dB; Resolution: 0.1db; Records Max/Min values all the time. Large LCD Screen of Decibel Tester: Features a large backlit screen with LCD display, easy to read the result. En quick response:Measurements in dBA Frequency; Frequency response: 31.5Hz ~ 8.5KHz. Records Max / Min values all the time. Portable ergonomic design: this sound level meter is easy to handle, robust and well finished, can easily slip into a bag and transportable.