Want to test sound levels and need to understand noise levels? Try our digital sound level meter. This sound level meter can be used to measure noise levels in different areas such as homes, schools, offices, music rooms, shopping malls, etc. Features: 9.5-inch large full-screen LCD display with large bold red fonts for easy reading. 24-hour real-time monitoring of sound levels. Supports hanging on the wall (recommended) or placed independently on the table. Wide measurement range 30dB to 130dB, frequency: 31.5Hz - 8KHz, resolution: 0.1dB/1dB, accuracy: +/-1.5dB. Has A and C equivalent weighted sound pressure levels. Fast and slow dynamic characteristics mode. With maximum/minimum value measurement. It will buzz and flash to remind you when the real-time measurement reaches the alarm level, and it will return to normal mode after holding the data for 3 seconds. Suitable for checking and monitoring sound levels in individuals, homes, businesses, schools, industries, etc. Specifications: Material: ABS Measurement range: 30~130dBA, 35~130dBC Frequency response: 31.5Hz~8.5kHz Accuracy: +/-1.5dB (reference sound calibration frequency, 94dB@1KHz) Frequency weighting: A or C weighted digital Display: 3 large LED digital display Resolution: 0.1dB below 100dB, 1dB above 100dB Display Mode: Fast and Slow Optional Microphone Type: Diameter. 6mm ECM type alarm mode: built-in alarm buzzer Operating voltage: USB DC5V 1A Operating temperature and humidity: 0~40 degrees Celsius, 10%~80% RH Storage temperature and humidity: 0~60 degrees Celsius, 10% ~70% RH Power supply : 5V 1A AC/DC adapter Item size: 221*66*32.5mm/8.70*2.60*1.28in Item weight: 518g/18.28oz Packing weight: 701g/24.74oz Packing size: 24.5*9.2*5.2cm/9.65* 3.62 * 2.05 inches Packing list: 1 * Sound level meter 1 * USB cable 1 * User manual (English)