The noise tester is a convenient and practical noise measurement tool. It adopts advanced acoustic measurement technology to quickly and accurately measure the decibel value of environmental noise. The outer shell is designed to be small and lightweight, usually made of durable plastic materials, making it easy to carry to different places for testing. Its advantage lies in its simple operation and fast measurement. It can obtain accurate noise data without complex settings. It is widely used in places such as factory workshops, shopping malls, schools, and hospitals. In factory workshops, it detects whether the noise generated by equipment operation exceeds the standard; in shopping malls, it evaluates the noise level of the shopping environment; in schools, it monitors the noise situation in teaching areas; in hospitals, it ensures a quiet environment in wards and other areas.