Originally developed for a manufacturer of downhole oil drilling tools, these transducers also serve R&D testing or wherever extreme environments exist - which standard LVDTs cannot withstand.
Models employ a perforated housing to equalize pressure inside and outside the instrument.
Previous 3/8 or 3/4-in. OD models are still available. All three LVDTs are rated to 35,000-psi at up to 450°F. continuous.