The STIT 2450 MHz Intelligent Three-Stub Tuner serves for manual impedance matching and, in connection with a waterload, for realization of reflection coefficients in wide range of the Smith Chart of the 2450 MHz ISM band. Based on the WR340 (R26) waveguide, the tuner basic design is derived from the HOMER-Series STHT 2450-MHz Autotuner. Each stub is equipped with a stepper motor and terminal switches. The desired stubs position can be easily adjusted and monitored by 3.2" colour LCD display with touch-panel. RS232, RS422 or CAN Bus interfaces are optionally available for remote control and monitoring.