The Celsius® Pak Frame RTD Holder is a device designed to be mounted on the horizontal rods located on top of the 8.3L and 16.6L Celsius® Pak Frames. The Celsius® Pak Frame RTD Holder is equipped with a locking collar that is used to adjust and secure the depth of the temperature probe to monitor the last point to freeze in the 8.3L and 16.6L Celsius® Paks. The RTD holder ensures that the temperature probe tip is always located at 1 cm below the liquid surface. The Celsius® Pak Frame RTD Holder provides an easy and reliable system to properly monitor the product temperature inside 8.3L and 16.6L Celsius® Paks during freezing and thawing processes in the Celsius® FT100.