RTD or TC assembly complete with manufactured thermowell or to be used with existing thermowell. An optional head transmitter, with all common communication protocols - Bluetooth® technology inclusive, and special features like iTHERM QuickNeck, for tool-free easy recalibration, vibration-resistant and fast-response sensor and thermowell technology (iTHERM StrongSens, QuickSens) as well as hazardous area approvals makes the device ready to use with enhanced measurement accuracy and reliability.