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: Brand Name: SMART SENSOR 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 Degrees Celsius (10%~80%RH) Storage Temperature: -10~60 Degrees Celsius (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