[Multi-functional Integration]: This multifunctional tester integrates various environmental testing functions, such as a noise meter, temperature tester, and humidity test meter, providing users with comprehensive, accurate, and convenient environmental detection services. [Accurate Sensing & Real Time Displaying]: With a digital display, real-time clear display of the parameters of the value of the environment. Temperature, humidity, and noise are displayed on the same screen, making it easier to read at a glance. [Humanized Design & Comfortable Experience]: This product features four control buttons that provide comfortable control and long-lasting durability, making it easy to use. The handheld body design makes it compact and lightweight, easy to carry, and suitable for on-site testing. [Built-in Rechargeable Lithium Battery]: Built-in 1600mA lithium battery with Type-C convenient charging interface, realizing the organic combination of low power consumption and stable performance, ensuring that the device has a long-lasting endurance, reducing the cost of use. It is an efficient, practical, and accurate multi-environment testing equipment. [Wide Applications]: The device is designed to operate function steadily and precisely in various environments, making it an essential safety detection tool in scientific research, industrial production, and daily use. This lithium battery environmental tester integrates various environmental testing functions such as a noise meter, temperature meter, and humidity test meter, providing users with comprehensive, accurate, and convenient environmental detection services. It is an essential safety detection tool in scientific research, industrial production, and daily use. Name: 3in1 Tester Battery: 1 * built-in 3.7V, 1600mAh lithium battery (included) Sound measurement: 30-130dBA