i have no esm in my sc setup and i was thinking about just getting the greddy e-manage but i saw two different kinds wich one should i get for easiest usage

 

There are two, the newer E-Manage Ultimate and the old E-Manage blue. The Ultimate has more functionality but costs nearly twice as much. Which one to pick depends on your budget and your future power goals.

Either will serve your purpose as a replacement for the Comptech esm voltage clamp.