The temperature calibrator is used for calibration of contact temperature sensors and infrared meters. A reference sensor can be inserted into a separate bore of the temperature reference source. Due to the built-in PID regulator, with a thin platinum coating, and the use of a 2 point precision inspection (PAC-function), the temperature reference source achieves high precision and reliability. An optional purchasable calibration certificate, based on national standards, verifies the quality of the temperature reference source.