This intelligent decibel meter is ready to use, click "▲" to enhance the brightness, click "▼" to reduce the brightness, click "M" to adjust the detection speed, there are three gears: fast, medium and slow. Double-click "M" to adjust the time. This large screen decibel meter has a 8.6 inch LED display with adjustable brightness, so you can easily read the real-time levels of decibels, time, temperature and humidity. [High ]: This sound level meter uses an intelligent air semiconductor sensor to test decibel temperature and humidity values. Compared with ordinary sensors, it is more sensitive, accurate and stable. The measurement range is 30~130dB, accuracy: ±1.5dB, frequency response range: 50Hz~8.5KHz; Humidity range: 20~85%, accuracy: ±5%; Temperature range: 14~122℉, accuracy: ±5%. This noise monitor is a great tool for checking, monitoring or controlling and testing the sound level of any environment and can be applied to noise engineering, product quality control, health prevention and treatment, etc. This large LED display decibel meter can be hung or placed on a table, making it an ideal noise meter for testing sound levels in classrooms, studios, major traffic , factories, construction sites, homes, offices, etc. This decibel meter built-in 2000mAh lithium battery power supply, comes with a 10 ft long USB cable charging, you can put it anywhere you want to place it, charging anywhere, anytime., Weight: 1.46938097623 pounds, Manufacturer: tiyao