to the well logging instrument 60 a connector 22 is mounted in lower sub 25 and provides electrical connection to a mating connector in the logging instrument 60 alternatively the connector 22 may include provision for both electric wire and optical fiber connections the connector 22 has typical o ring seals 23 and 24 to seal the lower end of sub 25 against wellbore fluid intrusion the upper end of lower sub 25 is threadably adapted to connect to strain gage sub 18 o rings 19 seal out wellbore fluid in the connection strain gage sub 18 has a reduced cross section 32 on which strain gages 35 are disposed in a standard strain gage bridge arrangement strain gages 35 may be bonded gages or vapor deposited gages both methods are known in the art and are not described herein wires not shown from the strain gages 35 are fed through holes 37 and 38 and fed to the connector 22 the strain gage sub 18 is coupled with threads to a lower housing 15 and the coupling joint is sealed with o rings 19 lower housing 15 has a large internal bore at one end to provide clearance for the strain gaged section of strain gage sub 18 a smaller seal bore is at the other end to allow passage of the load rod 14 and o ring 17 seals the lower housing 15 against fluid intrusion the load rod 14 is inserted through the bore and joined with threads to the strain gage sub 18 and functions to transfer external forces to the strain gage body the internal cavity 42 containing the strain gages 35 is thus sealed and isolated from the external environment in contrast to the.