The precise position of the capillary tubes in relation of the camera is different for each melting point apparatus and so the ROI for each capillary tube will need to be manually set by the user before you can perform an automatic melting point.
You can access the ROI settings screen from the settings screen:
Wait a few seconds for the camera image to arrive
Above you can see the 3 tubes (white), a red, green and blue rectangle. Each rectangle can be moved by dragging the squares in the corners.
The idea is to drag the rectangles so that they hug their corresponding tubes:
When you are satisfied with each ROI setting, press the SAVE button. If you need to reset the ROI positions preset the reset button