Board type PID temperature controller incorporate a bright, easy to read 4-digit LED display, the size of the PCB board is customizable according to customer's need. may OEM customers use this controller, on a conventional DIN size temperature controller, the display and the PCB board and everything else is built together in a plastic housing, it is not user friendly for some of application, the board type is a perfect solution where the mounting space is limited. The controller can be made to work with multiple inputs like TC/RTD, and output can be relay, SSR Drive and analog such as 4-20mA, the power source can be DC source like 24VDC for safety purpose. Customer who use this kind of controller normally require at least some degree of custom made elements to it. please fell free to contact us for further discussion.