Extech Instruments 4-Channel Thermometer Sd Logger With Nist SDL200-NIST. 4-Channel datalogging with 6 Thermocouple types (J K E T RS) and 2-Channel datalogging with RTD (Pt100Ohm) probes. Displays T1 T2 T3 T4 or differential T1-T2 readings. Offset...