Strength versus accurate and fast temperature measurement is a balancing act. the factors which tend to produce high strength also tend to reduce the temperature sensor's accuracy and speed of response. a properly selected thermowell will balance these opposing factors to produce a design capable of functioning satisfactorily in the intended application, selection. For special applications: Monel, hastelloy, sandvik af &apm,ceramic,ptfecoating,siliconnitrade ,carbide & graphite for molten