Optional RTD Temperature Probe for use with the REED R2450SD & SD-947 Data Logging Thermometers. REED R2450SD-RTD Offers Features Measurement range: -58 to 752°F (-50 to 400°C) Class A RTD accuracy Compatible with R2450SD & SD-947 Data Logging Thermometer 5.9" (152mm) probe length 0.12"(3.2mm) probe diameter 9.7" (245mm) probe handle length Included REED R2450SD-RTD PT100 RTD Temperature Probe