1. It is a perfect sound level meter for measuring noise levels in home, factories, offices, theaters and o systems. 2.Digital Sound Level Meter Measuring Range: 30~130dBA; Accuracy: +/- 1.5dB; Resolution: 0.1db; Records Max/Min values all the time. 3.Large LCD Screen of Decibel Tester: has a large backlight screen with LCD display, easy to read the result. 4.Quick response:Measurements in dBA Frequency; Frequency response: 31.5Hz~8.5KHz. Records Max/Min values all the time. 5. Portable Ergonomic Design: This sound level meter is good grip, sturdy and well finished, can easily slip into a bag and carry. Product Specifications Measurement Range: 30~130dBA Accuracy: 1.5dBA Resolution: 0.1dB Frequency Response: 31.5Hz~8kHz Operating temperature and humidity: 0~40, 10~80%RH Storage temperature and humidity: -10~60, 0~90%RH Power supply: 3*1.5V AAA battery (not included) Product size: 50*33*159.5mm White color Quantity delivered: 1 piece