This screen meter has a 11 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 semiconductor sensor to test temperature and humidity values. Compared with ordinary sensors, it is more sensitive, 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 LED display meter can be hung on the wall or placed on a table, making it an ideal noise meter for testing sound levels in classrooms, studios, major routes, factories, construction sites, homes, offices, etc. This intelligent meter is to , 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 meter -in 2000mAh lithium battery supply, comes with a 10 ft long USB cable charging, you can put it anywhere you want to place it, charging anywhere, anytime. Material: ABS colour: As shown Package Contents: 1 x Meter 1 x charging cable Only the above package content, other products are not included. Note: Light reflection and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.