The Winland EAPro ULS is an ultra-low temperature sensor accessory built for the EnviroAlert Professional Gateway and the EAPro Wireless Multi-Function Transmitter (EAPro-WMFT), extending monitoring down to -148 to +32 degrees Fahrenheit for deep-freeze and cold-storage applications. It uses a stainless-steel thermistor sensor in a sturdy stainless-steel housing built to tolerate harsh cold-storage conditions, and supports a maximum cable run of 1,000 feet using 18-22 AWG twisted-pair wiring back to the gateway or transmitter. As a wired probe, it's the path Winland recommends for ultra-cold environments that its standalone wireless sensors aren't rated for.