?Sound Noise Meters?The Gedaye MT-911 decibel meter complies with IEC standards. is ideal for neighbors noise complaints, job-site and noise pollution monitoring. Perfect for monitoring noise levels in communities, home theaters, audio systems, automobiles, workshops, schools, offices, factories. ?Wide Ranges, High Accurate?Gedaye MT-911 decibel meter is automatically calibrated every time it is turned on. The Noise Meter features a high-sensitivity, high-precision condenser microphone, capable of measuring noise levels from 35 to 135 dB, high accuracy of 2.0 dB, frequency from 31.5Hz to 8KHz. ?A-Weighting, Fast/Slow Measurement? This SPL contains A-weighting and Time-weighting. A-weighting is to simulate the frequency of low-intensity human ear noise, is it more accurate and professional for the detection of environmental noise. The Fast response rate is 125ms for general environmental measurements. Slow response rate of 1s for environmental measurements with relatively large variations in noise levels. ?Date Hold, Max/Min Measurement?The sound pressure level meter has a Max/Min measurement value, which indicates the High/Low peak value of the sound produced over a certain period of time. The Data Hold function freezes the current reading on top of the sound measurement according to individual needs. ?Thermometer, Digital LCD Display?The MT-911 noise meter contains thermometer fuction, range from -4? to 158 ?, accuracy 2.7?. It's colorful LCD digital screen with backlight, You can easily read even when you are at night or in sunlight. ?Package Include?1x MT-911 Decibel Meter, 3x AAA Batteries, 1x Windproof Cotton Cover, 1x User Manual. (Service: If the product has quality problems, Gedaye will offers a 1-year free replacement service).