Abstract: There are provided an apparatus for temperature calibration of temperature sensors, and a liner for use in such an apparatus, wherein the liner (9) is adapted to be placed in a cavity (5) in a dry block (1) in the apparatus, and is arranged to receive at least one sensor to be calibrated. The liner has a cavity (10) which is adapted to receive a heat transferring liquid (11) and one or more sensors (13, 14) in the liquid-filled cavity (10). The liner preferably constitutes a container having an open end which is provided with a cap (12) for closing the container.