Precise Measurement: The sound level meter does not need to be touched, it can measure sound quality in various environments and display test results quickly and accurately. Sensitive Sensor: The sound level meter uses professional high-precision sensors with excellent sensitivity and accuracy. Its performance is stable and reliable. High Definition Display: Large, high-intensity LED-backlit display, able to cope with bright light, night and other conditions. Automatic Shutdown: This sound level meter has an automatic shutdown function and automatically turns off after 3 minutes of inactivity, protecting the environment and saving energy. Widely Used: This sound level meter is widely used in vehicle noise testing, industrial equipment noise testing and home noise testing. Product description <br> Data retention function, measurement of maximum and minimum values. <br> Low battery indication, automatic and manual shutdown function. <br> Equipped with a sponge ball for sensor protection. <br> Specification:Accuracy: 1.5dB <br> Frequency range: 31.5Hz to 8.5Hz <br> Measurement level: 30-130dBA <br> Resolution: 0.1dB <br> Time weighting: fast <br> Power supply: 3 AAA 1.5V alkaline batteries (not include) <br> Microphone: 1/2 inch electret condenser microphone <br> Operating temperature: 0-40 <br> Operating humidity: 10% -80% RH <br> Storage temperature: -10-60 <br> Storage humidity: 10% -70% RH <br> Weight: approx. 111g / 3.9oz <br> Size: approx. 155 * 50 * 25mm <br> Package list: <br> 1 * digital sound level meter <br> Instructions for use <br> 1. Open the battery compartment cover, enter 3 new * AAA batteries, close the battery compartment cover. <br> 2. Press the start power switch button. <br> 3. Wait until the LCD display is normal, can enter the test state. <br> 4. You can press 'MODE' button to select 'MAX', then read the maximum noise. <br> 5. Backlight switch button can turn the backlight on or off. <br> 6. When the battery symbol appears, replace the battery for low power consumption instructions. <br> Precautions <br> 1.Do not use the device in high temperature and humidity environments. <br> 2.If it is not used for a long time, remove the battery from the machine. <br> 3.Once the device is used in the presence of wind, it is essential to mount the windshield so as not to pick up unwanted signals.4.Operating environment condition: Humidity80% RH, temperature from 0 to 40. <br>