The Yokogawa UT550-03 is a versatile, high-performance handheld process calibrator designed for field technicians and instrument engineers. It is a core model in the UT550 series, specializing in the calibration and troubleshooting of pressure instruments alongside a comprehensive suite of electrical and temperature functions. It integrates a precision pressure module with the capabilities of a signal calibrator, measurement tool, and loop power supply into a single, robust device.