The EnviroAlert Professional® Ultra Low Sensor (“EAPro®-Ultra Low Sensor”) or ("RTD-PT1000 Sensor") is a wired stainless-steel temperature sensor accessory for the EAPro®-Gateway and EAPro®-Wireless Multi-Function Transmitter to monitor the temperature range of -148 to +257 °F (-100 to +125 °C) with an accuracy of ±3.6 °F (±2.0 °C) as a part of the Winland Critical-Environment Monitoring Solution.