This noise meter is designed to test sound level in various environment. It is widely used in noise control engineering, quality control, health and treatment, home environment monitoring, etc.   Features: Mini digital sound level meter with stable and reliable performance.  Wide measurement range from 30dB to 130dBA.  Fast and slow sampling rate for choice: 125ms or 1s.  Data hold function, maximum and minimum value measurement.  LCD display with backlight, convenient to use at night.  Low battery indication, automatic & manual power off function.  Compact and light, convenient to hold and carry.  Equipped with sponge ball for sensor protection.   NOTE: When measuring under MAX mode, the meter will only display the value greater than the current value; when measuring under MIN mode it will only display the value less than the current value.   Specifications: Color: White;  Material: ABS Plastic;  Display: 5 digits LCD, Max Display 99999;  Measuring Range: 30～130dBA;  Resolution: 0.1dB;  Accuracy: 1.5dB (under reference conditions);  Frequency Range: 31.5Hz to 8.5Hz;  Frequency Weighting: A Weighted;  Over Range: LCD Show Over;  Time Weighting: Fast;  Sampling Rate: 2times/s;  Operating Temperature: 0～40℃ (10%～80%RH);  Storage Temperature: -10～60℃ (10%～70%RH);  Power Supply: 3 * 1.5V AAA Batteries (Not Included);  Item Size: 15 * 5 * 2.7cm / 5.91 * 1.97 * 1.06in;  Item Weight: 72.6g / 2.56oz;  Package Size: 22 * 15 * 3.2cm / 9.25 * 4.53 * 1.26in;  Package Weight: 109.2g / 3.85oz;   Package List: 1 * Digital Sound Level Meter;  1 * User Manual