how to recognize shield mods

So, to get a decent ES shield for a decent price, on must seek a shield with:
- +maximum energy shield
- +%energy shield and +%stun recovery
- a free prefix

and craft a +%energy shield on the free prefix

however, the mods are not listed on the wiki, and stun recovery can roll on its own,
so there is no way to diferenciate one or two prefix +%energy shield/+%stun recovery

what kind of design is that?

so I'm left, randomly buying low +%energy shield/+%stun recovery with a free prefix, hoping that the +%energy shield/+%stun recovery is only one prefix.

again,
what kind of design is that?

any advice?

1. stun recovery by itself is a suffix
2. if the seller is not dumb, he checked on his own if the shield has a free prefix (masters help in this)
3. check if es% and stun rec match the values of the hybrid mod http://poeaffix.net/index.html
4. what you're trying to do it's not easy and shit happens

This website is awesome, I've never heard of it before, many affixes are lacking in the wiki, thanks.

It helps a lot to get the value of items.