Product Description: The sound level meter is an instrument for measuring the ambient sound level, for example the sound level in the environment of factories, workshops, schools, residential buildings, offices, roads, audio, etc.【Data Hold Function】With the measurement range of 30-130dB and shifting function. Digital display, good anti-interference performance, energy saving. The sound level tester records the minimum and maximum sound level in decibels in a specific time range and freezes the current measurement values.【Backlight Function】With backlight function, it is suitable for capturing data at night. The backlight automatic shutdown function is more durable.【Auto shutdown and overload alarm】If no operation within 10 minutes, the noise detector will automatically shut down to save power. Overload alarm, if it is lower than 30dB, the display shows "UN"; if it is more than 130dB, the screen displays "OL".【Occasions】It can also be used for acoustic technology, product quality control, health prevention and treatment, etc. This audio noise detector is a great tool for checking, monitoring or controlling and testing the sound level in any environment. It is widely used for individual, family, business, study, industry, etc.