The TrolMaster PCT-1 2-in-1 EC + Temp Sensor is an essential tool for any hydroponic system. This reservoir temp sensor is designed for both indoor and outdoor use, ensuring accurate temperature measurements for optimal plant growth. With a height of 12 inches and a length and width of 2 inches, this sensor is compact and easy to install. The TrolMaster PCT-1 2-in-1 EC + Temp Sensor comes with a set that includes a reservoir, making it a complete solution for your hydroponic needs. It is suitable for use in hydroponic systems and is ideal for those who want to monitor the temperature of their plants. This product is perfect for those who want to ensure that their plants are growing optimally and want to keep an eye on the temperature of their reservoir.