probes , blast furnaces equipped therewith , and methods of fabricating probes . such a probe includes a base , a shell connected to the base and constructed of at least first and second housing members that extend together along a length of the probe in a longitudinal direction thereof , and at least one support structure interconnecting the first and second housing members . the probe includes a coolant circuit comprising at least one coolant passage within an interior cavity of the shell . the coolant passage has at least one tube supported by the support structure so that the tube contacts at least one of the first and second housing members . at least one sensor is disposed in the second housing member for performing a measurement at an exterior of the shell .