New style (spherical housing) high-T logger. A) shows interior of spherical housing with 2 Onset computer chips (green wafers) visible. B) shows probe tip and housing (quarter for scale reference). C) RTD elements shown, lower one is raw RTD and upper two are encased in ceramic plug. D) loggers shown with polyethylene covers which also serve to attach syntactic foam for floatation. E-F) drawings of internal and external views of spherical high-T loggers showing location of Swage pressure fitting that seals tubing from the housing where the computer chips are stored. This configuration provides the ability to service the loggers at sea and replace tips that may have had to be broken off in chimney walls. In this case, the Ti tubing tips are replaced, as are the RTD elements and connector, and the unit can be placed back into service on the same cruise.