1. It is a perfect sound level meter for measuring noise levels in home, factories, offices, theaters and audio 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.Fast 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 easy to grip, robust and well finished, can easily slip into a bag and transportable. Product description Digital sound level meter. Noise measurement tester for indoor/outdoor use This portable digital sound level meter is applicable for the measurement of noise engineering, quality control, pollution prevention health and various environmental noises, including noise measurement in factories, offices, route transportation, families, stereo equipment and other places. Features: Measurement range: 30~130dBA 2. Accuracy: 1.5dB. 3. Frequency response: 31.5Hz~8kHz. Resolution: 0.1dB. Operating temperature and humidity: 0~40, 10~80% RH 6. Storage temperature and humidity: -10~60, 0~90% RH 7. Power source: 3 x 1.5V AAA batteries (included). High Accuracy: With stable performance and high accuracy, perfect for sound level measurement (30 dBA - 130 dBA). < p>[Easy to use] With simple buttons. The power button can turn on/off the power and backlight; MIN/MAX button can display MAX/MIN measurement; HOLD button can hold data. Multiple Uses: Comes with compact and lightweight design, designed to fit comfortably in your palm, convenient to carry. Widely used to monitor noise level in factories, offices, theaters and audio systems. Notes: Please do not use the meter in high temperature environment and humid. Please remove the batteries when not in use for a long time to avoid electrolyte leakage and damage to the meter. When measuring noise outdoors, please mount the windproof ball on the microphone head so that it is not blown directly by the wind and measure other noises.