THERMOMETER The Extech SDL200 thermometer displays and stores temperature readings from up to four ( 4) Type K, J, T, E, R, or S thermocouple temperature probes and two ( 2) Pt100 RTD probes. Logged data readings are stored on an SD card for transfer to a PC. In addition, an RS232 port allows data streaming to a PC. Features 4-Channel datalogging with 6 Thermocouple types ( J, K, E, T, R, S) and 2-Channel datalogging with RTD ( Pt100© ) probes Displays [ T1, T2, T3, T4] or differential [ T1-T2] reading 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: 1 to 3600 seconds Min/ Max and Data Hold functions Auto power off with disable function Built-in PC interface Complete with 6 AA batteries, four general purpose Type K bead wire temperature probes, SD card, and hard carrying case Specifications:  Type J: -148 to 2192° F ( -100 to 1200° C)  Type K: -148 to 2372° F ( -100 to 1300° C)  Type T: -58 to 752° F ( -50 to 400° C)  Type E: -58 to 1652° F ( -50 to 900° C)  Type R: 32 to 3092° F ( 0 to 1700° C)  Type S: 32 to 2732° F ( 0 to 1500° C)  RTD ( Pt100) : -327 to 1562° F ( -200 to 850° C)  Resolution: 0.1° / 1°  Basic Accuracy: ± 0.4% rdg ( + 1.8° F/ + 1° C) Types J, K, E, T, Pt100 ± 0.5% rdg ( + 2° F/ + 1° C) Types R, S Datalogging: 20M data records using a 2G SD card Dimensions: 7.2 x 2.9 x 1.9 " ( 182 x 73 x 47.5mm)  Weight: 17.6oz ( 500g)