The TT-77 Model is a temperature switch developed by Bühler Technologies. It has an alternative continuous temperature signal and 1 programmable set point. This unit is supplied with two outputs that is programmable from 1 Hz to 100 Hz. It also comes with a LED display to show measured value. This device features a window and hysteresis function, standardized manu structure, and 1-m maximum dip tube length. Moreover, this model can be installed directly or remotely.