The SDL200 records data to an SD card in Excel format. 4-channel data acquisition with 6 thermocouple types (J, K, E, T, R, S) and 2-channel data acquisition with RTD (Pt-100 Ω) probes. Displays [T1, T2, T3, T4] or differential values [T1-T2]. Offset button for zero function for relative measurements. Stores 99 readings manually and 20 million readings on a 2G SD card. Reading logging with true date and time stamp. User programmable sampling rate from 1 to 3600 seconds. Min/Max, reading memory and auto power off. Includes 6 AA batteries, four general purpose bead wire temperature probes (Type K), SD card and hard carrying case.