【Widely Used】 A sound level meter is an instrument used to measure ambient sound levels. It can be used in homes, factories, workshops, schools, residential areas, offices, streets, hotels, hospitals, laboratories, theaters, and public address systems. Its application range is very wide and it is an indispensable tool in life. 【High Accuracy】 The measuring range of the sound level meter is 30 dB to 130 dB, with a fast response speed and stable and reliable performance. This product is a high-precision sound level meter with an accuracy of ± 2.0 dB. Real-time monitoring can provide you with accurate data on the noise level in the area. 【A/C Dual Weighting Measurement】 A-weighting simulates the frequency characteristics of low-intensity human ear noise, making it suitable for detecting ambient noise. C-weighting simulates the frequency properties of high-intensity human ear noise, making it suitable for analyzing the sound pressure of machine motors and machinery. 【Fast and Slow Response Rate Conversion】 The sound level meter has the function of converting fast and slow response rates. The fast response rate uses a time constant of 125 milliseconds for general environmental measurement. The slow response rate uses a 1-second time constant, which is used for environmental measurements with relatively large changes in noise levels. 【Large Display】 The digital display is a 4-digit LCD with a resolution of 0.1 dB. Large backlit LCD digital display, the reading effect is clearer in dark places. When the battery is low, the LCD screen displays a low-voltage icon, indicating that the power is low at this time and the battery needs to be replaced. The environmental noise standard is to maintain people's well-being and living environment and limit the permissible noise area. Formulation principles: They should be based on the protection of people's hearing, sleep and quiet, speech and thinking, and be advanced, scientific and realistic. Excessive noise has a negative impact on human physiology and psychology. In daily life and living environment, noise can cause hearing loss, pre-disturbed conversations, thinking and sleep. Features simple operation, simple operation, wide dynamic range, LCD digital display with large screen and automatic measurement. It can be widely used to measure industrial and environmental noise of various machines, vehicles, ships, electrical appliances, etc., and can be used for acoustic testing in factories and enterprises, construction design, industrial hygiene and transportation, teaching, medical and health, scientific research and other departments are sufficient. High Accuracy Noise Accuracy: ± 2.0 dB (sound pressure reference standard, 94 dB at 1 kHz) Frequency Response: 31.5 Hz ~ 8 kHz Dynamic Range: 50 dB Measuring Range: 30 ~ 130 dB Battery Powered The device is equipped with two 1.5 V batteries. When the battery is empty, you can open the screw on the battery cover on the back of the meter, remove the battery cover and replace it with a new battery. Low Voltage Display When the battery is low, a low voltage icon appears on the LCD display, indicating that the battery is low at this point and needs to be replaced with a new one. Maximum Hold Press the "F/S/MAX" button for 2 seconds to enter the MAX Maximum Hold function and measure the maximum noise in the area. (Press again for 2 seconds to exit the MAX Hold function.) Normal Noise Range Excessive noise has a negative impact on human physiology and psychology. In the daily working and living environment, noise mainly causes hearing loss and affects speech, thinking, rest, and sleep. Product Configuration Sound Level Meter (Battery Included) * 1