Feature: 1. 【A/C Weighted Measurement】Decibel meter uses a precise condenser microphone to capture sound. It’s equipped with A-weighting and C-weighting facilities that measure noise levels from 30 to 130 dB with an accuracy of ±1.5 dB, Frequency from 31.5 to 8,000Hz. Real-time monitoring can give you accurate data on the sound level in the area. 2. 【Digital LCD Screen】This NF-562S sound level meter is measured noise levels are expressed in decibels (dB) and displayed on the LCD screen, it easy to read on a big display design. Long press the backlight button to turn on a backlight, making it easy to view even in damn light. 3. 【Fast and Slow Measurement】The sound level meter has the function of converting the fast and slow response rate. The fast response rate uses a time constant of 0.125s/time for general environmental measurement. The slow response rate uses a 1s/time constant, which is used for environmental measurements with relatively large changes in noise levels. 4. 【MAX/MIN Measurement, Date Hold】The sound pressure level (SPL) meter has Max or Min measurement values to represent the maximum/minimum (high/low peak) value of the sound produced within a certain time, and the data hold function can freeze the current reading based on the sound measurement according to individual needs. 5. 【Easy Use and automatic power-off function】A low battery indicator will appear on the screen when the battery is low to remind the user to replace the battery in time. sound level meter is lightweight and easy to carry.  Specification: Specifications: Model: NF-562S Material: ABS Accuracy: ±1.5dB (at reference pressure level, 94dB@1KHz) Frequency Response: 31.5Hz~8.0KHz Dynamic Range: 50dB Measuring Range: 30~130dBA, 35~130dBC Frequency Weighting Characteristic: A/C Weighted Digital Display: 4-bit digital display, resolution 0.1dB, sampling rate 2 times/second Analog Characterization Display: One characterization represents 1dB, and the sampling rate is 2 times/second Measuring Gear: 30~80dB, 60~110dB, 80~130dB, 30~130dB (AUTO) Overload Indication: "OVER" "UNDER" symbols represent Dynamic Characteristic: FAST, SLOW Reaction rate The Maximum and Minimum Values Are Locked: MAX/MIN locked Power Supply Mode: 4 * AA batteries (Not included) Low Battery Reminder: