good belt tensioner tool

whats a good tool for belt tensioners, to turn it and get the drive belt off? I know it has to be long so you have good leverage, and 1/2 drive right? my friend had this wrench that extends and that worked pretty good

Breaker bar.
Cheap buy it anywhere.

Check the tool racks at your auto parts store. A good choice will have a good length and an extension that can be attached at different angles and some adapters. Breaker bars work in some cases but I find todays engine bays too tight,no clearance for a breaker bar. Especially imports. One that I have comes to mind is an Ampro. Reasonably priced. Although sometimes none of them seems to fit and ya gotta get creative.