From Standard Platinum Resistance Thermometers with fixed point cells attaining the International Temperature Scale (ITS-90) to within a few thousandths of a degree, to low uncertainty liquid-bath comparison calibrations from -196°C to +500°C, to thermocouples from 0°C to 1200°C, Process Instruments primary temperature standards and references can be used to calibrate virtually any type of thermocouple and thermometer.