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Wide applications: the decibel meter has a highly sensitive device that is able to measure noise level from 30 to 130 dB with an accuracy of ±1.5 dB, which can be used in noise technology, quality control, health control and various environmental tests. It is widely used for individuals, classrooms, restaurants, families, businesses, studies, industry, etc. Alarm functions: Hum and flash to remind you when the real-time measurement has reached the alarm level, and hold the data for 3 seconds and then return to normal mode. With the hanging hole, the sound level meter can be mounted on the wall or stand freely on the table. Large LCD display: large LCD digital display with backlight - super large 9.6 inch LCD digital display with backlight, which makes reading in dark areas clearer and more visual. Easy to use: DB meter with backlight shutdown function, short press the "change machine" button, long press the "change machine" button, automatic start function: the product turns on automatically when connected to the power supply. Long press the "Change machine" button to shut it down. About us: The SPL meter comes with an easy-to-read instruction manual (English language not guaranteed). If you have any problems or suggestions about our sound meter, please let us know and we offer 7 x 24 hours technical support and customer service.