Accurate Measurement: The sound level meter does not need to be touched, it can measure the sound quality in various environments, and display the test results quickly and accurately. Sensor Sensitive: 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, coping with bright light, night and other conditions. Auto-off: This sound level meter has an auto-off function and will automatically shut down after 3 minutes of inactivity, environmental protection and energy saving. Widely Used: This sound level meter is widely used in vehicle noise testing, industrial equipment noise testing and home noise testing. Product Description Data hold function, measurement of maximum and minimum values. Low battery indication, automatic and manual power off function. Equipped with a sponge ball for sensor protection. Specification: Accuracy: 1.5dB Frequency range: 31.5Hz to 8.5Hz Measurement level: 30-130dBA Resolution: 0.1dB Time weighting: fast Power supply: 3 AAA 1.5V alkaline batteries (not include) Microphone: 1/2 inch electret condenser microphone Operating temperature: 0-40 Operating humidity: 10% - 80% RH Storage temperature: -10-60 Storage humidity: 10%-70% RH Weight: approx. 111g / 3.9oz Size: approx. 155*50*25mm Package list: 1*digital sound level meter The user manual 1. Open the battery compartment cover, insert 3 new * AAA batteries, close the battery compartment cover. 2. Press the boot power switch button. 3. Wait for the LCD screen display to be normal, can enter the test state. 4. You can press the 'MODE' button to select 'MAX', then read the maximum noise. 5. Backlight switch button can turn on or off the backlight. 6. When the battery symbol appears, replace the battery for low power consumption instructions. Precautions 1.Do not use the device in high-voltage environments. temperature and humidity. 2.If it is not used for a long time, remove the battery from the machine. 3.After the device is used in the presence of of wind, it is essential to mount the windshield to avoid picking up unwanted signals. 4.Operating environment condition: Humidity80% RH, temperature 0 to 40.