Features MEASUREMENT ACCURACY: Equipped with a sensitive and precise condenser microphone, this decibel meter reliably measures noise levels ranging from 30 dB to 130 dB with an outstanding accuracy of ± 0.1 dB. VERSATILE APPLICATIONS: Ideal for assessing noise pollution in a variety of settings, this sound LevelMeter excels in monitoring traffic, nurseries, classrooms, home theaters, and industrial environments. Its rapid sampling rate of 2 times per second ensures timely and relevant readings. ENHANCED VISIBILITY DISPLAY: Featuring a substantial backlit LCD display with a 4-digit resolution and increments of 0.1 dB, the meter delivers clear visibility in dim conditions, with an alert function for when sound levels surpass preset thresholds. USER-FRIENDLY DESIGN: The decibel meter's lightweight construction promises extended, comfortable use without causing hand fatigue. Its compact, ergonomic design fits snugly in the hand, while the rubberized, non-slip grip ensures secure handling. INTELLIGENT POWER MANAGEMENT: An automatic shutdown feature activates after 11 minutes of inactivity, preserving battery life. Additionally, the decibel meter's battery LevelIndicator keeps users informed of remaining power. 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