Mac book pro power adapter mixed to each other how to identify

dear i am facing some issue in our office .
issue is our macbook pro charger has mixed to each other.
for that i am facing some charer support issue when it is not working.
how can i identify .
I have  more than 100 mac book comp.

First off, for the regular MacBook Pros (non-Retina) there are basically two sizes: large 85W and small 65W. Large is used on 15" and 17" models, small on 13" model. They are physically different in size too and are labeled along the edge.
Retinas use an 85W power brick, but the connector at the Mac end is MagSafe II, which is very smaller than the regular MagSafe used on non-Retinas. No way to confuse and no way to plug them wrong.
BTW, if an MB Air got mixed in there, they use an even smaller 45W brick. But you mentioned MBP.

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