Feature:1. LCD DISPLAY: Portable noise meter, LCD display with backlight function, you can clearly view the readings even in a dark environment.2. HIGH SENSITIVITY: Built in 1/2 inch polarized capacitive sensor, 31.5Hz‑8KHz frequency response, stable and efficient, providing fast and accurate measurement.3. HIGH RESOLUTION: The measurement range is 30dB‑130dB, the resolution is 0.1dB, high accuracy, suitable for measuring the sound quality of the environment.4. MULTIFUNCTION: Mini sound level meter, powerful, supports data retention, maximum and minimum measurement functions, compact and easy to carry.5. WIDE RANGE OF USES: This noise meter is very suitable for use in cars, rooms, theaters, home appliances, factories, schools, buildings and other occasion.How to Use:1. Use a screwdriver to open the battery back cover, insert the battery and install the battery back cover to start the machine (battery not included)2. After powering on, select the range to start measurement.Specification:Item Type: Sound Level MeterMaterial: ABSModel: DT-815Battery: 6F22 9V x 1 Battery (Battery Not Included)Purpose: Sound Level MeasurementDisplay: LCD Display Range Low Frequency Band 30dB-80dB Mid Band 50dB-100dB High Band 80dB-130dB Auto Band 30dB-130dB Resolution 0.1DB Error At 94dB, ±1.4dB 1kHz sine waves Sensor 1/2 inch polarized capacitive sensor Frequency Response 31.5Hz-8KHz Frequency Weighting Characteristics A and C Time Weighting 125 milliseconds fast, 1 second slow Data Retention √ Maximum Minimum √ Data Retention 50 Package List:1 x