The P18D-300M0 temperature and humidity converter made by Lumel is a device that is powered by a 9 to 24 VDC or a 9 to 24 VAC power supply and is designed to measure and record temperature and humidity levels ranging from -20 to 60 degrees Celsius. It is reliable, accurate, and suitable for both industrial and residential applications. It is capable of monitoring and controlling the surrounding environment, making adjustments as necessary. It also comes with a number of safety features, including an overload protection and short-circuit protection, as well as options for connecting to an external alarm system.