How can you tell what level an enemy is? These spells say that they are only useful on 'Undead up to level 36' but how do I know what level they are and if it's even useful?

I guess I just need a scouter....

Not sure. Only way I know how to check is by casting it in them to see if it will affect him. If they are affected by it, I know similar types of that enemy are likely to also be affected. For example, I've determined that my Greater Turn Undead effects all undead except Dragur Deathlords and above, who will resist.

Lame. I wish that there was a way to tell.

Sounds realistic