Portable Sound Level Meter: A handy little tool ideal for noise monitoring, home theater setup, health and safety compliance, vehicle noise testing, etc HD Digital LCD Display: Large readable LCD display With backlight, which can quickly display the measurement, clearly and easily readable. Power Source: 3 AAA batteries, low battery indicator, automatic shutdown without operation after 10 minutes, convenient and energy saving. Multi-function: 30-130 dBA measurement range. Maximum/Minimum/Data Hold Function - Auto Power Off - Battery Indicator: Directly check the remaining battery. Widely Uses: Designed to meet the measurement requirements of sound quality control in various environments. Ideal for testing music recording, neighbor noise complaints, industrial settings, office settings, voice therapy and more. Precise measurements. Our lever sound level meter can read between 30 and 130 dBa, while reducing the effects of wind noise to produce more accurate readings. The decibel sound level meter provides +/-1.5dBA measurements providing some of the most accurate results. Multi-Function: Maximum/Minimum Data Hold/Auto Power Off function; battery indicator: Directly check the remaining battery. Microphone with windproof ball. 1.27cm electric condenser microphone, sensitively detect sound changes. Features: Range: 30-130dBA. Accuracy : 1.5dB. Resolution : 0.1 dB - Frequency range: 31.5Hz~8kHz. Sampling frequency : 2 times/sec. Microphone: 1.27 cm electret condenser microphone. HD digital LCD display. Large readable LCD display with backlight, which can display the measurement quickly, clearly and easily to read. Multiple uses: Designed to meet the measurement requirements of sound quality control in various environments. Ideal for testing music recording, noise complaints from neighbors, industrial settings, office settings, voice therapy and more. 1. Remove the windproof ball. How to open the battery door: 2. Push the sound level meter out of the protective case. How to open the battery door: 3. Install 3 x 1.5V AAA batteries. How to open the battery door: Assemble the device. Turn on the sound level meter