Features MEASURE DETAILS: The decibel meter has a sensitive and accurate condenser microphone, which can measure the noise level from 30 to 130 dB with an accuracy of ± 0.1 dB. APPLICABLE SCENARIOS: The decibel meter is very suitable for measuring environmental noise, such as traffic noise, nursery noise, classroom noise, home theater noise, industrial noise, etc. The sampling rate is 2 times per second, which is very suitable BACKLIT LCD: The sound level meter has a large backlit LCD display with 4 bit and 0.1 dB resolution, ensuring that the reading is clearly visible and easy to operate in low light environment. When the sound level exceeds the set value, the backlit displa EASY TO USE: The lightweight design allows long time operation and reduces muscle fatigue. The compact design ensures that the noise meter can be held comfortably in the hand. The non slip and rubberized side ensures that the decibel is easy to hold. AUTOMATIC SHUTDOWN: When the sound level meter is not used for about 11 minutes, it will automatically shut down to extend the battery life. And there is a indicator for you to display the battery capacity. Specification: Item Type: Decibel Meter Material: ABS Measuring Range: 30 to 130dBA Measurement Error: ± 1.5dB( 94dB at 1KHz) Frequency Range: 31.5Hz to 8kHz Digital Display: 4 digits Resolution: 0.1dB Sampling Rate: 2 times per second Microphone: 1/2 inch electret condenser microphone Frequency Weighted: A weight Response Time: 0.5s Maximum, Minimum: Support Data Locking: Support HD Backlight: Support Automatic shutdown for 11 minutes without operation Working Humidity: 10 to 80% RH Working Temperature: 0 to 40 ℃ Product Power Supply: 1 x 800mAh 6F22 alkaline dry battery (shipped with supporting battery) Package List:1 x Decibel Meter1 x Battery 1 x Manual  Package List 1 x Decibel Meter 1 x Battery 1 x Manual