The calibrator thermometers Model 42311 (Type J) and Model 42312 (Type K) source or measure Type J or K thermocouples. In the source mode, different output values are quickly selected using the rotary switch and fine and coarse adjustments. Source temperature ranges up to 2000¯F (1093¯C). In the measurement mode, the thermometers accept one or two thermocouples with Data Hold and Max functions. Basic accuracy is 0.1% with 0.1¯/1¯ resolution. Source and measurement valves are displayed on a large backlit LCD.