During measurements in each bath, the thermocouple was contained in a borosilicate glass tube (7 mm outer diameter and 5 mm inner diameter), 500 mm long closed at the bottom.
The thermocouple was positioned such that it’s measuring.
Junction was at the same immersion as the mid point of the sensing element of the SPRT.
The depth of immersion was 30 cm below the liquid surface in the bath.
In all baths the temperature difference between the sensing element of the SPRT and that of the measuring junction of the thermocouple differed by not more than 0.01 C, based on previous measurements of the temperature uniformity of each bath used.