Application: The sound level can be used in homes, factories, workshops, schools, residential spaces, offices, streets, hotels, hospitals, laboratories, theaters and sound systems . Backlight function: The backlit Decibel Meter display has a clearer reading effect in the dark. When battery is low, the LCD screen displays a low voltage icon and battery needs to be replaced. >Digital display: The digital noise meter has a 4-digit LCD display with 0.1dB resolution. Large backlight LCD digital display, the reading effect is clearer in the dark . A/C dual-weighted measurement: A-weighted noise audio detector is suitable for environmental noise detection. C-weighted simulations are suitable for sound pressure analysis of motors and machinerymachine. High Accuracy: The noise tester has a measurement range of 30dB to 130dB, fast response, stable and reliable performance, and an accuracy of 2.0dB.