Product Description High precision: The noise meter has a high-sensitivity, high-precision microphone sensor that can measure noise levels from 30 to 130 dB, accuracy: 1.5 dB, resolution: 0.1 dB. A-weighting, fast/slow measurement: A-weighting simulates the frequency of low-intensity sounds in the human ear and is more professional for detecting environmental noise. Fast response time is 125ms for general environmental measurements. Slow response time of 1s for environmental measurements with relatively large fluctuations in noise levels. Date memory, max/min measurement: The sound pressure level meter has a max/min reading that indicates the highest/lowest peak value of the sound generated over a certain period of time. The data hold function freezes the current sound measurement reading according to individual needs. Digital LCD Display: High-definition, energy-saving screen, long press the backlight button turns on the backlight, making the display easy to read even in low light conditions. Wide Application: Mainly used in residential area, construction site, factories, restaurants, entertainment and other various occasions of environmental monitoring, etc. Specifications: Model: NF-562 Material: ABS Display: FSTN LCD screen Button: 4 function keys Sensor: High capacity microphone Noise test: Test: 30-130dB Test accuracy: 1.5dB Resolution: 0.1dB Test speed: FAST: 125ms SLOW: 1s Over alarm: Yes MAX/MIN test: Yes Auto-off: 5 minutes without operation Data storage/backlight: Yes LCD backlight control: Yes Low battery warning: Yes Battery: 3 * 1.5V AAA batteries (not included) Item Size: 160 * 50 * 30mm / 6.29 * 1.97 * 1.18in Package Weight: 200g / 7.05oz Package Size: 21 * 10.6 * 4.5cm / 8.26 * 4.17 * 1.77in Package List: 1 * Sound Level Meter 1 * User Manual (English) Remarks: 1. Due to different measurement methods, the measurement allows an error of about 2-3 cm. This situation is not a quality problem. (1 inch = 2.54 cm) 2. Due to different lighting and screens, the color of the product may be different from the original color. Please prevail in kind. Thank you for your understanding, have a nice day!