Whether you're monitoring installing audio, workplace machinery or alarm systems, or handling product noise certification and reduction, this noise meter gets the job done. This sound decibel meters measure sound pressure level and are commonly used in noise pollution studies for the quantification of almost any noise, but especially for industrial, environmental and aircraft noise. However, the reading given by a sound level meter does not correlate well to human-perceived loudness; for this a loudness meter is needed. Data hold to freeze reading on digital display. This sound decibel meter is designed to meet the measurement requirements of safety engineers, health, industrial safety offices and quality control in various environments. The Sound Pressure Level is designed with an accuracy of ±1.5dB; and the sound decibel meter ranges from 30-130dBA to 35-130dBC. Digit & Resolution is 5digits & 0.1dB; uses A & C frequency weighting, 1/2 inch polarization capacitance microphone. Ideal for noise surveys in the installing fire alarms, workplace and speaker systems and enforcing noise ordinances. It is perfect for sound system testing, speaker system measurement and environmental noise level monitoring. This digital sound meter can surely help you a lot in your daily life or working.Come on and take this noise meter! You will never regret!