The 471566 Thermistor Probe is a high-precision water temperature sensors designed for pool and spa systems : Not need for special tools or modifications Whether you are maintaining your home pool or spa, or performing professional equipment servicing, this sensors ensures your systems operates at optimal temperatures, protecting both your equipment and your comfort This thermistor probe is a direct replacement for 471566 models and is compatible with a wide ranges of pool and spa equipment It accurately monitors water temperature, helping to maintain safe, comfortable, and energy-efficient conditions in your pool or spa Made from Copper and plastics, it offers long lasting use and readings, even in harsh pool environments