Features High Quality Material: This is a noise meter made of high quality ABS, which can make the service life longer. Backlight Display: The noise meter has an automatic backlight display, which is convenient for viewing in dark conditions. Decibel Display: The noise meter can display, measure the absolute high and low peak decibels (Maximum Minimum) and switch the display. Power Reminder: A noise meter with low power reminder function will automatically shut down to save power when is not used for a long time. Applicable Fields: The noise meter is suitable for the frequency spectrum of many different fields such as music recording, neighbor noise complaints, industrial environment, office environment, speech therapy and so on. Specification: Item Type: Noise Measure Device Model: GM1351 Material: ABS Measuring Range: 30-130 dBA Accuracy: ±1.5 dB Digital Resolution: 4 Digits & 0.1 dB Frequency Weighting Characteristics: A (Simulating Human Ears) Sampling Frequency: 2 Times Per Sec Microphone: 1/2in Condenser Microphone Usage Scenarios: Suitable for the Spectrum of Many Different Fields Such as Music Recording, Neighbor Noise Complaints, Industrial Environment, Office Environment, Speech Therapy and so on. Ship without Battery, Use a 9V 6F22 Square Battery Package List: 1 x Noise Meter 1 x User Manual  Note: Please read the user manual before use, and use after you understand clearly; be careful not to use for a long time in a humid rainy environment. Package List 1 x Noise Meter 1 x User Manual