ACCURATE MEASUREMENT: The measuring range of the sound level meter is 30dB to 130dB . Highly accurate with 1.5 dB. Real-time monitoring gives you accurate data on noise in the area. AUDIBLE AND VISUAL ALARMS: Setting high/low alarm values, if the measured value higher than it,Red color alarm back light will light up to alert you it is over the high/low alarm value. MAX/MIN Measurement: The sound level 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. A WEIGHTED MEASUREMENT: The A weighted simulates the frequency characteristics of low-intensity human ear noise, which is suitable for the detection of ambient noise. More professional measurement methods provide users with a more perfect user experience. DIGITAL LCD DISPLAY : The digital display is a 4-digit LCD display with a resolution of 0.1 dB. Large backlit LCD digital display, the reading effect is clearer in dark places. When the battery is low, the LCD display will display a low voltage icon, indicating that the power is low at this point and the battery needs to be replaced.