What is the difference between model numbers ending in BAA and models ending in AAA?

Both controllers have the same form, fit, and function in fact they are the same controller with the exception of the program menus. The PM controllers ending in BAA have a more user-friendly EXPRESS menu that is application-oriented for thermal control. The PM controllers ending in AAA have a more comprehensive menu that in addition to thermal control the programming of various other processes such as pressure, humidity, valve control and much more is included in the programing menu.