AZ Instruments 4 Channel K Type Thermometer SD Card Data Logger Thermocouple Temperature + 2 Bead Type K-Thermocouple Probe K Temp. Range : -200 to 1370C, -328 to 2498F / Resolution: 0.1C/F / Accuracy (under 18~28C ambient temp.) : (0.3%rdg + 1C) Sampling Rate : Programmable from 1 second up / LCD Size: 47 x 104mm Operating Temp. : 0~50C / Operating Humidity: &lt;80% Storage Temp.: -20~50C / Storange Humidity: &lt;90% Power Supply : AA Batteries (included in the set) or 9V adaptor (not included in the set)