The SDL200 records data on an SD card in Excel format. 4-Channel datalogging with 6 Thermocouple types (J, K, E, T, R,S) and 2-Channel datalogging with RTD (Pt100Ohm) probes. Displays [T1, T2, T3, T4] or differential [T1-T2] readings. Offset adjustment used for zero function to make relative measurements. Stores 99 readings manually and 20M readings via 2G SD card. Records readings with real date and time stamp. User programmable sampling rate from 1 to 3600 seconds. Min/Max, Data Hold, Auto Power Off. Complete with 6 AA batteries, four general purpose Type K bead wire temperature probes, SD card, and hard carrying case.