Quantity: One piece Designed for sound quality monitoring: The sound level meter simply presses a button and the readings are displayed instantly. Digital sound level meters are handy gadgets for noise pollution monitoring, home theater setups, health and safety compliance, automotive noise testing, and more. Backlight design: The decibel meter increases the intensity of the lighting display as ambient lighting conditions decrease. The darker the environment, the brighter the light. In addition, it can read dBA data and provide a windshield to filter out unwanted signals. The automatic backlight has a light sensor on the LCD screen that detects ambient lighting conditions. Function: This is a simple and easy-to-use digital sound level meter. Designed for sound quality monitoring, it measures sound levels from 30 dBA to 130 dBA. With auto range, wide range, frequency range (31.5Hz~8KHz), maximum hold, A-weighted frequency, automatic backlight and other functions. Sensitive sensor: noise tester response time 0.5s, no contact. Noise levels can be measured in any situation and accurate readings are displayed quickly. Multi-function: This decibel detector is an instrument for measuring environmental sound levels, such as the sound level of factories, workshops, schools, residential buildings, offices, streets, loudspeakers, etc. Good quality product