Description: 1. High accuracy and fast response: The response time of the noise meter is less than 1s, and the ultra-fast response allows you to easily obtain real-time and accurate sound test values in various environments. The measurement range is 30-130dB, the accuracy is 0.1dB and the resolution is 1dB. 2. Automatic shutdown and overload alarm: The noise meter will automatically shut down if there is no operation within 10 minutes to save power. Overload alarm, when it is less than 30 dB, the screen will display "UN", when it is greater than 130 dB, it will display "OL". 3. Data retention and maximum/minimum lock: Short press the "M" key to easily switch between the maximum/minimum/real-time mode. The button "H" (hold) can freeze the decibel value currently measured on the screen, which can meet your various measurement needs. 4. Easy to operate: The simple design with 4 function buttons makes the handheld noise meter very easy to use. The ergonomic handheld arc and ultra-lightweight design bring you a comfortable handheld experience. 5. Large-size LCD display: Large-size LCD display, with backlight function, can provide clear readings, so that you can get data under any light. 6. Applicable occasions: The noise meter is an ideal measurement tool for sound testing, which is widely used in factories, workshops, schools, and home. Specifications: Product name: Noise meter Color: Black Material: ABS Measuring range: 30dB-130dB Measurement accuracy: 0.1dB Working temperature: 0-40°C Resolution: 1db Power by: 1 x 9V battery (not included) Size: About 209*64*40mm/8.23*2.52*1.57inch(L*W*H) Package Includes: 1Pc * Noise meter 1Pc * Manual