Designed with user functionality and performance in mind, the HI935004 is a waterproof T-type thermocouple thermometer that measures temperature from -50.0 to 300°C (-58.0 to 572°F). The included batteries provide up to 3500 hours of continuous use. CAL Check™ and the Battery Error Prevention System (BEPS) ensure that the readings are accurate. The probe is replaceable and other T-Type thermocouple probes are also available