The Extech 45158 Waterproof Thermo-Anemometer is a compact and reliable device designed for measuring air velocity, temperature, and wind-chill. This pocket-sized instrument is ideal for a variety of applications, both indoors and outdoors.The Extech 45158 features a waterproof design, allowing you to use it confidently in various weather conditions. It simultaneously displays air velocity and temperature or wind-chill on the LCD screen, providing you with real-time readings for quick and easy analysis.One of the key features of the Extech 45158 is its selectable averaging function. You can choose from 5, 10, or 13-second intervals to calculate the average air velocity and temperature. This feature is particularly useful when you need more stable and accurate measurements in fluctuating conditions.The fold-up protective housing of the meter extends to 9 inches (229mm), providing a better reach and allowing for more convenient measurements. The meter also comes with a mountable tripod, enabling hands-free operation and improved stability during longer measurement sessions.The Extech 45158 includes data hold and auto power off functions. The data hold function allows you to freeze the displayed readings, ensuring that you can easily record or analyze the data without the risk of losing it. The auto power off function helps conserve battery life by automatically turning off the meter after a period of inactivity.